Jump to content

Search the Community

Showing results for tags 'lower cretaceous'.

  • Search By Tags

    Type tags separated by commas.
    Tags should be keywords or key phrases. e.g. otodus, megalodon, shark tooth, miocene, bone valley formation, usa, florida.
  • Search By Author

Content Type


Forums

  • Community News
    • Member Introductions
    • Member of the Month
    • Members' News & Diversions
  • Fossil Discussion
    • General Fossil Discussion
    • Questions & Answers
    • Fossil Hunting Trips
    • Fossil ID
    • Partners in Paleontology - Member Contributions to Science
    • Fossil of the Month
    • Member Collections
    • A Trip to the Museum
    • Paleo Re-creations
    • Collecting Gear
    • Fossil Preparation
    • Is It Real? How to Recognize Fossil Fabrications
    • Member-to-Member Fossil Trades
    • Fossil News
  • General Category
    • Rocks & Minerals
    • Geology

Categories

  • Annelids
  • Arthropods
    • Crustaceans
    • Insects
    • Trilobites
    • Other Arthropods
  • Brachiopods
  • Cnidarians (Corals, Jellyfish, Conulariids )
    • Corals
    • Jellyfish, Conulariids, etc.
  • Echinoderms
    • Crinoids & Blastoids
    • Echinoids
    • Other Echinoderms
    • Starfish and Brittlestars
  • Forams
  • Graptolites
  • Molluscs
    • Bivalves
    • Cephalopods (Ammonites, Belemnites, Nautiloids)
    • Gastropods
    • Other Molluscs
  • Sponges
  • Bryozoans
  • Other Invertebrates
  • Ichnofossils
  • Plants
  • Chordata
    • Amphibians & Reptiles
    • Birds
    • Dinosaurs
    • Fishes
    • Mammals
    • Sharks & Rays
    • Other Chordates
  • *Pseudofossils ( Inorganic objects , markings, or impressions that resemble fossils.)

Blogs

  • Anson's Blog
  • Mudding Around
  • Nicholas' Blog
  • dinosaur50's Blog
  • Traviscounty's Blog
  • Seldom's Blog
  • tracer's tidbits
  • Sacredsin's Blog
  • fossilfacetheprospector's Blog
  • jax world
  • echinoman's Blog
  • Ammonoidea
  • Traviscounty's Blog
  • brsr0131's Blog
  • brsr0131's Blog
  • Adventures with a Paddle
  • Caveat emptor
  • -------
  • Fig Rocks' Blog
  • placoderms
  • mosasaurs
  • ozzyrules244's Blog
  • Terry Dactyll's Blog
  • Sir Knightia's Blog
  • MaHa's Blog
  • shakinchevy2008's Blog
  • Stratio's Blog
  • ROOKMANDON's Blog
  • Phoenixflood's Blog
  • Brett Breakin' Rocks' Blog
  • Seattleguy's Blog
  • jkfoam's Blog
  • Erwan's Blog
  • Erwan's Blog
  • marksfossils' Blog
  • ibanda89's Blog
  • Liberty's Blog
  • Liberty's Blog
  • Lindsey's Blog
  • Back of Beyond
  • Ameenah's Blog
  • St. Johns River Shark Teeth/Florida
  • gordon's Blog
  • West4me's Blog
  • West4me's Blog
  • Pennsylvania Perspectives
  • michigantim's Blog
  • michigantim's Blog
  • lauraharp's Blog
  • lauraharp's Blog
  • micropterus101's Blog
  • micropterus101's Blog
  • GPeach129's Blog
  • Olenellus' Blog
  • nicciann's Blog
  • nicciann's Blog
  • Deep-Thinker's Blog
  • Deep-Thinker's Blog
  • bear-dog's Blog
  • javidal's Blog
  • Digging America
  • John Sun's Blog
  • John Sun's Blog
  • Ravsiden's Blog
  • Jurassic park
  • The Hunt for Fossils
  • The Fury's Grand Blog
  • julie's ??
  • Hunt'n 'odonts!
  • falcondob's Blog
  • Monkeyfuss' Blog
  • cyndy's Blog
  • pattyf's Blog
  • pattyf's Blog
  • chrisf's Blog
  • chrisf's Blog
  • nola's Blog
  • mercyrcfans88's Blog
  • Emily's PRI Adventure
  • trilobite guy's Blog
  • barnes' Blog
  • xenacanthus' Blog
  • myfossiltrips.blogspot.com
  • HeritageFossils' Blog
  • Fossilefinder's Blog
  • Fossilefinder's Blog
  • maybe a nest fossil?
  • farfarawy's Blog
  • Microfossil Mania!
  • blogs_blog_99
  • Southern Comfort
  • Emily's MotE Adventure
  • Eli's Blog
  • andreas' Blog
  • Recent Collecting Trips
  • retired blog
  • andreas' Blog test
  • fossilman7's Blog
  • Piranha Blog
  • xonenine's blog
  • xonenine's Blog
  • Fossil collecting and SAFETY
  • Detrius
  • pangeaman's Blog
  • pangeaman's Blog
  • pangeaman's Blog
  • Jocky's Blog
  • Jocky's Blog
  • Kehbe's Kwips
  • RomanK's Blog
  • Prehistoric Planet Trilogy
  • mikeymig's Blog
  • Western NY Explorer's Blog
  • Regg Cato's Blog
  • VisionXray23's Blog
  • Carcharodontosaurus' Blog
  • What is the largest dragonfly fossil? What are the top contenders?
  • Test Blog
  • jsnrice's blog
  • Lise MacFadden's Poetry Blog
  • BluffCountryFossils Adventure Blog
  • meadow's Blog
  • Makeing The Unlikley Happen
  • KansasFossilHunter's Blog
  • DarrenElliot's Blog
  • Hihimanu Hale
  • jesus' Blog
  • A Mesozoic Mosaic
  • Dinosaur comic
  • Zookeeperfossils
  • Cameronballislife31's Blog
  • My Blog
  • TomKoss' Blog
  • A guide to calcanea and astragali
  • Group Blog Test
  • Paleo Rantings of a Blockhead
  • Dead Dino is Art
  • The Amber Blog
  • Stocksdale's Blog
  • PaleoWilliam's Blog
  • TyrannosaurusRex's Facts
  • The Community Post
  • The Paleo-Tourist
  • Lyndon D Agate Johnson's Blog
  • BRobinson7's Blog
  • Eastern NC Trip Reports
  • Toofuntahh's Blog
  • Pterodactyl's Blog
  • A Beginner's Foray into Fossiling
  • Micropaleontology blog
  • Pondering on Dinosaurs
  • Fossil Preparation Blog
  • On Dinosaurs and Media
  • cheney416's fossil story
  • jpc
  • A Novice Geologist
  • Red-Headed Red-Neck Rock-Hound w/ My Trusty HellHound Cerberus
  • Red Headed
  • Paleo-Profiles
  • Walt's Blog
  • Between A Rock And A Hard Place
  • Rudist digging at "Point 25", St. Bartholomä, Styria, Austria (Campanian, Gosau-group)
  • Prognathodon saturator 101
  • Books I have enjoyed
  • Ladonia Texas Fossil Park
  • Trip Reports
  • Glendive Montana dinosaur bone Hell’s Creek
  • Test
  • Stratigraphic Succession of Chesapecten

Find results in...

Find results that contain...


Date Created

  • Start

    End


Last Updated

  • Start

    End


Filter by number of...

  1. RCD

    Is this a Limpet fossil?

    Hi. This was found in a spot in the SF East Bay area, CA, right on the border between Eocene/Domingene and Lower Cretaceous sedimentary. Spiral-shaped gastropods and bivalves are dominant, but I found this oval one shown in the middle of the pic below. It's a familiar shape, maybe a Limpet? Any thoughts appreciated.
  2. Kikokuryu

    Elrhaz Crocodylomorph Fang?

    While I was sorting through my collection of croc fossils, I came across these Elrhaz Formation teeth I bought 6 months ago and never did figure out what they were. I assume they are croc and not some kind of fish, though I could be wrong. I've never seen these apart from the one source I purchased them from. I've been told they were Sarcosuchus, then Kaprosuchus, then Suchomimus. Pretty sure it's not Sarcosuchus, and the images I can find of Kaprosuchus don't seem to match. Suchomimus, I don't know, but my gut feeling is, no, I've seen dozens of Suchomimus and fake-Sucho crocs, and never found a match. If anyone is familiar with this morphology, any input is appreciated. Locale: Gaoufaoua, Tenere Desert, Niger Last picture is a couple of other crocs from the same lot. One (the robust one on the right) is probably Sarcosuchus.
  3. Troodon

    New Abelisaurid from Brazil

    The attached paper describes a new Abelisaurid from the lower Cretaceous of Brazil: Spectrovenator ragei . Its a good paper to keep as a reference source when trying to identify material from other geographic areas like Morocco http://sciencepress.mnhn.fr/fr/periodiques/comptes-rendus-palevol/19/6
  4. A few weeks back the Paleontological Society of Austin went out on one of our monthly field trips. The weather was still quite warm and we decided to keep it closer to home so no one would be to wrung out when we were done. We are hopefully at the tail end of a rather brutal drought with constant triple digit temps that started back in June. We picked three sites within 90 minutes of Austin that took us up thru the Glen Rose Formation, bottom to top. We started at a site in the Lower Member known as the micro zone. Fossils big enough to see from a standing position are few but if you get down and crawl around you can be rewarded with a crazy variety of tiny echinoids, starfish and crinoids and other odd bits in amongst the usual molluscs. The second site was at the very top of the Lower Member in the Salenia texana zone and folks found their share. But it was the last stop way up in Unit 7 of the Upper Member that I found my keeper* for the day. I had collected this site over the years and knew it as good for small echinoids and on occasion ammonites. But I was going back with some fresh information provided by the local researcher William Rader. Bill Rader had informed me that the site produced vertebrate material including many years before a crocodile scute. When we got there I spent time in the ammonite zone and helping others find fossils but it was at the tail end of the afternoon as I was thinking about the drive home that I moved to some lower layers that generally just produce common molluscs. AND BAM! Bones... Now I just assumed they were turtle which isn't uncommon in the Glen Rose but always a good find. I found two of the pieces within inches and they fit together. Jamie Shelton was there and I called her over to help me scan the spot with an extra set of eyes. I found a third piece before we quit. The next day was Identification Day at Texas Memorial Museum and PSA was manning the invertebrate table. But I knew there would be a few vertebrate specialists as well. As the day wound down I found a moment to show them to Chris Sagebiel of UT. He wasn't quite sure at first but when I mentioned that croc material was known from the site he immediately thought that it was a match. * Chris asked what I was planning on doing with the specimen (nudge nudge) and I agreed it should go to the Vertebrate lab here at UT. Here are some pics of the bones and a few from the day.
  5. I have some teeth from Cognac area to ID. Selachians found are Parvodus, Polyacrodus, Lissodus, Hybodus, Hybodontidae, Rhinobatidae but I don't know them. Is someone knows this fauna ? Here are 4 pics done with my phone, but perhaps I have to try with an APN... They are very very small. It is written "Portlandian" on the pics but the right stage is Berriasian. I think I have 2 different species in my collection, and I must do a lot of pics Thanks for you help. Coco
  6. Siamraptor suwati a new Carcharodontosaurian, a first from Southeast Asia, from the lower Cretaceous of Thailand, is described in the attached paper National Geographic press release https://www.nationalgeographic.com/science/2019/10/huge-new-shark-toothed-dinosaur-siamraptor-found-in-thailand/ Cosmos Press release https://cosmosmagazine.com/palaeontology/early-cretaceous-predator-discovered-in-thailand Smithsonian Press release https://www.smithsonianmag.com/science-nature/newly-discovered-dinosaur-was-giant-shark-tooth-predator-rival-tyrannosaurs-180973304/ Paper https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0222489
  7. K-boy Cachers

    I Finally Found One!

    I've known about these little dudes for years, but they've always been like the Yeti to me: heard of them, believed in their existence, but never laid eyes on one for myself. Well, this evening I decided to accompany the fam on a walk/bike ride at the park that is two blocks down the road (referenced in previous topics/posts). I've been finding some interesting coral specimens down there lately and was looking fairly close to the ground, somewhat stooping against the gentle slope. . . . and there she was! In all of her 9 mm of chalky limestone beauty! My wife's comment was "I don't understand how you even see those tiny little things." I replied, "well, for the past 11 years, I haven't!" 11 August 2019 Salenia texana (in matrix) Lower Cretaceous Commanche Peak fm. Western Bell County, Texas, USA
  8. K-boy Cachers

    Think it's a tooth, but should it be?

    17 August 2019 Shark tooth? Lower Cretaceous - Walnut formation Western Bell County, Texas, USA I found this in the nearby park where I've found many of the normal central Texas fossils over the years (oxytropidocerous, salenia, parasmilia, heart urchins, gastropods, snails, etc.). My eyes tell me this thing looks a lot like a shark tooth. But my brain is trying to get me to disagree. Here's why I'm stumped: 1. While it makes sense that shark tooth fossils COULD be found in this area, along with all of the other sea life, we aren't known for turning up many teeth. In fact, I've not found any in this area yet and haven't really heard of others finding them around here either. 2. The shark teeth I have found in other areas, such as Post Oak Creek, have all looked . . . well, like fossilized shark teeth. This one looks like the chalky limestone in which it was found. Which has me wondering if it's a tooth or not. I welcome your input.
  9. K-boy Cachers

    A Cross-section of Something, Perhaps?

    This peculiar thing caught my eye while I was out looking for urchins, clams, gastropods and all of the other bountiful fossil blessings of Central Texas. This was in an intermittent creek cut in the Comanche Peak formation, Lower Cretaceous period, western Bell County, Texas. The scale in the background is inches (sorry, no metric device readily available). The oval shape of the fossil is 1.5 cm by 1 cm. All of the lines you see making up the fossil are crystalized sediment within the limestone matrix. My 8 year old was excited about how "sparkly" it looked under the flashlight. In a couple of the pictures you can see what appears to be a very small section of the side of the fossil. I am stumped on this one. My hunch is that i'm seeing the inside of an organism that we typically get to see the outside of. But i don't know what the insides of the urchins look like. Seems too oval to be a cross section of phymosoma texanum. Maybe it was a plant or coral? Could it be a flattened-out, crystalized Parasmilia?
  10. https://www.eurekalert.org/pub_releases/2018-12/uoc-to121418.php
  11. From the album: MY FOSSIL Collection - Dpaul7

    Tylostoma tumidum Gastropod cast SITE LOCATION: Mills County, Texas, USA TIME PERIOD: Lower Cretaceous (100-145 million years ago) Data: Tylostomatidae is an extinct family of fossil sea snails, marine gastropod molluscs in the superfamily Stromboidea, the true conchs and their allies. Genera within the family Tylostomatidae include: Tylostoma, the type genus. Kingdom: Animalia Phylum: Mollusca Class: Gastropoda Order: Littorinimorpha (Infraorder) Family: †Tylostomatidae Genus: †Tylostoma Species: †tumidum
  12. From the album: MY FOSSIL Collection - Dpaul7

    Tylostoma tumidum Gastropod cast SITE LOCATION: Mills County, Texas, USA TIME PERIOD: Lower Cretaceous (100-145 million years ago) Data: Tylostomatidae is an extinct family of fossil sea snails, marine gastropod molluscs in the superfamily Stromboidea, the true conchs and their allies. Genera within the family Tylostomatidae include: Tylostoma, the type genus. Kingdom: Animalia Phylum: Mollusca Class: Gastropoda Order: Littorinimorpha (Infraorder) Family: †Tylostomatidae Genus: †Tylostoma Species: †tumidum
  13. Dpaul7

    Loriolia echinoid Fossil a.jpg

    From the album: MY FOSSIL Collection - Dpaul7

    Loriolia echinoid Fossil SITE LOCATION: Comal County, Texas, USA TIME PERIOD: Lower Cretaceous (100-145 million years ago) Data: Loriolia is a genus of extinct sea urchins from the Emiratiidae family. The Emiratiidae are a family of extinct sea urchins (Echinoidea) of the order Phymosomatoida. The Phymosomatoida are an order of sea urchins, found in Europe, North America, North Africa and the Middle East. They are distinguished from other sea urchins by the presence of large fused plates on top of the feeding lantern. The test is usually sculpted to some degree, but, unlike their close relatives the Temnopleuroida, the tubercles are never perforated. The opening in the test through which the anus passes, known as the periproct, is unusually large in sea urchins from this group. The apical disc, around the mouth, is only loosely attached to the rest of the test and is often missing in fossil species, giving the false impression that they also have a large oral opening Kingdom: Animalia Phylum: Echinodermata Class: Echinoidea Order: Phymosomatoida Family: †Emiratiidae Genus: †Loriolia
  14. Dpaul7

    Loriolia echinoid Fossil a.jpg

    From the album: MY FOSSIL Collection - Dpaul7

    Loriolia echinoid Fossil SITE LOCATION: Comal County, Texas, USA TIME PERIOD: Lower Cretaceous (100-145 million years ago) Data: Loriolia is a genus of extinct sea urchins from the Emiratiidae family. The Emiratiidae are a family of extinct sea urchins (Echinoidea) of the order Phymosomatoida. The Phymosomatoida are an order of sea urchins, found in Europe, North America, North Africa and the Middle East. They are distinguished from other sea urchins by the presence of large fused plates on top of the feeding lantern. The test is usually sculpted to some degree, but, unlike their close relatives the Temnopleuroida, the tubercles are never perforated. The opening in the test through which the anus passes, known as the periproct, is unusually large in sea urchins from this group. The apical disc, around the mouth, is only loosely attached to the rest of the test and is often missing in fossil species, giving the false impression that they also have a large oral opening Kingdom: Animalia Phylum: Echinodermata Class: Echinoidea Order: Phymosomatoida Family: †Emiratiidae Genus: †Loriolia
  15. Dpaul7

    Tapes decepta Mollusk Cast a.jpg

    From the album: MY FOSSIL Collection - Dpaul7

    Tapes decepta Mollusk Cast SITE LOCATION: Glen Rose Formation, Bandera County, Texas, USA TIME PERIOD: Lower Cretaceous (100-145 million years ago) Data: Clams and their relatives (oysters, scallops, and mussels) are often called bivalves (or bivalved mollusks) because their shell is composed of two parts called valves. Bivalves have a long history. Their fossils first appear in rocks that date to the middle of the Cambrian Period, about 510 million years ago. Although the group became increasingly abundant about 400 million years ago during the Devonian Period, bivalves really took off following the massive extinction at the close of the Permian Period. Modern bivalves live in a variety of marine and freshwater environments, from the shallow waters near shore to great depths in the ocean. Fossils indicate that bivalves have occupied most of these environments for more than 450 million years, but during the Paleozoic Era they were especially common in near-shore environments. The Veneridae or venerids, common name the venus clams, are a very large family of minute to large, saltwater clams, marine bivalve molluscs. Over 500 living species of venerid bivalves are known, most of which are edible, and many of which are exploited as food sources. Many of the most important edible species are commonly known (in the USA) simply as "clams". Venerids make up a significant proportion of the world fishery of edible bivalves. The family includes some species that are important commercially, such as (in the USA) the hard clam or quahog, Mercenaria mercenaria. Kingdom: Animalia Phylum: Mollusca Class: Bivalvia Order: Veneroida Family: Veneridae Genus: Tapes Species: decepta
  16. Dpaul7

    Tapes decepta Mollusk Cast a.jpg

    From the album: MY FOSSIL Collection - Dpaul7

    Tapes decepta Mollusk Cast SITE LOCATION: Glen Rose Formation, Bandera County, Texas, USA TIME PERIOD: Lower Cretaceous (100-145 million years ago) Data: Clams and their relatives (oysters, scallops, and mussels) are often called bivalves (or bivalved mollusks) because their shell is composed of two parts called valves. Bivalves have a long history. Their fossils first appear in rocks that date to the middle of the Cambrian Period, about 510 million years ago. Although the group became increasingly abundant about 400 million years ago during the Devonian Period, bivalves really took off following the massive extinction at the close of the Permian Period. Modern bivalves live in a variety of marine and freshwater environments, from the shallow waters near shore to great depths in the ocean. Fossils indicate that bivalves have occupied most of these environments for more than 450 million years, but during the Paleozoic Era they were especially common in near-shore environments. The Veneridae or venerids, common name the venus clams, are a very large family of minute to large, saltwater clams, marine bivalve molluscs. Over 500 living species of venerid bivalves are known, most of which are edible, and many of which are exploited as food sources. Many of the most important edible species are commonly known (in the USA) simply as "clams". Venerids make up a significant proportion of the world fishery of edible bivalves. The family includes some species that are important commercially, such as (in the USA) the hard clam or quahog, Mercenaria mercenaria. Kingdom: Animalia Phylum: Mollusca Class: Bivalvia Order: Veneroida Family: Veneridae Genus: Tapes Species: decepta
  17. Dpaul7

    Heteraster texanus Echinoid a.jpg

    From the album: MY FOSSIL Collection - Dpaul7

    Heteraster texanus Echinoid SITE LOCATION: Commanche Park Formation, Mills County, Texas, USA TIME PERIOD: Lower Cretaceous (100-145 million years ago) Data: Heteraster is an extinct genus of sea urchins belonging to the family Toxasteridae. These slow-moving shallow infaunal deposit feeder-detritivores lived during the Cretaceous period. Fossils of this family have been found in the sediments of Algeria, Egypt, France, Hungary, Mexico, Peru, Portugal, Serbia and Montenegro, Spain, Switzerland and Yemen. Kingdom: Animalia Phylum: Echinodermata Class: Echinoidea Order: Spatangoida Family: †Toxasteridae Genus: †Heteraster Species: †texanus
  18. Dpaul7

    Heteraster texanus Echinoid a.jpg

    From the album: MY FOSSIL Collection - Dpaul7

    Heteraster texanus Echinoid SITE LOCATION: Commanche Park Formation, Mills County, Texas, USA TIME PERIOD: Lower Cretaceous (100-145 million years ago) Data: Heteraster is an extinct genus of sea urchins belonging to the family Toxasteridae. These slow-moving shallow infaunal deposit feeder-detritivores lived during the Cretaceous period. Fossils of this family have been found in the sediments of Algeria, Egypt, France, Hungary, Mexico, Peru, Portugal, Serbia and Montenegro, Spain, Switzerland and Yemen. Kingdom: Animalia Phylum: Echinodermata Class: Echinoidea Order: Spatangoida Family: †Toxasteridae Genus: †Heteraster Species: †texanus
  19. Dpaul7

    Kingena Brachiopod a.jpg

    From the album: MY FOSSIL Collection - Dpaul7

    Kingena Brachiopod SITE LOCATION: Main St. Formation, Johnson County, Texas, USA TIME PERIOD: Lower Cretaceous (100-145 million years ago) Data: Kingena is an extinct genus of brachiopods that lived from the Cretaceous to the early Paleocene in Antarctica, Europe, North America, and New Zealand. Terebratulids are one of only three living orders of articulate brachiopods, the others being the Rhynchonellida and the Thecideida. Craniida and Lingulida include living brachiopods, but are inarticulates. The name, Terebratula, may be derived from the Latin "terebra", meaning "hole-borer". The perceived resemblance of terebratulid shells to ancient Roman oil lamps gave the brachiopods their common name "lamp shell". Kingdom: Animalia Phylum: Brachiopoda Class: Rhynchonellata Order: Terebratulida Family: †Kingenidae Genus: †Kingena
  20. Dpaul7

    Kingena Brachiopod a.jpg

    From the album: MY FOSSIL Collection - Dpaul7

    Kingena Brachiopod SITE LOCATION: Main St. Formation, Johnson County, Texas, USA TIME PERIOD: Lower Cretaceous (100-145 million years ago) Data: Kingena is an extinct genus of brachiopods that lived from the Cretaceous to the early Paleocene in Antarctica, Europe, North America, and New Zealand. Terebratulids are one of only three living orders of articulate brachiopods, the others being the Rhynchonellida and the Thecideida. Craniida and Lingulida include living brachiopods, but are inarticulates. The name, Terebratula, may be derived from the Latin "terebra", meaning "hole-borer". The perceived resemblance of terebratulid shells to ancient Roman oil lamps gave the brachiopods their common name "lamp shell". Kingdom: Animalia Phylum: Brachiopoda Class: Rhynchonellata Order: Terebratulida Family: †Kingenidae Genus: †Kingena
  21. From the album: MY FOSSIL Collection - Dpaul7

    Texigryphaea marcoui bivalve SITE LOCATION: Mills County, Texas, USA TIME PERIOD: Lower Cretaceous (100-145 million years ago) Data: Gryphaea, common name Devil's toenails, is a genus of extinct oysters, marine bivalve mollusks in the family Gryphaeidae. These fossils range from the Triassic to the Tertiary periods, but are mostly restricted to the Triassic and Jurassic. Both periods belong to the era Mesozoic. They are particularly common in many parts of Britain. These oysters lived on the sea bed in shallow waters, possibly in large colonies. The complete fossils consist of two articulated valves: a larger gnarly-shaped shell (the "toenail") and a smaller, flattened shell, the "lid". The soft parts of the animal occupied the cavity between the two shells, just like modern oysters. The shells also feature prominent growth bands. The larger, curved shell sat within the mud on the sea floor. These shells are sometimes found in fossil plates along with Turritella, clams, and sometimes sharks' teeth and fossilized fish scales. Its distribution is common in areas of both Europe and North America. A classic location to find these fossils is Redcar, on the northeast coast of England. There used to be a common folk belief that carrying one of these fossils could prevent rheumatism. They are also found in abundance in the state of Kansas in riverbeds and cliffs as well as the Big Horn Canyon of Wyoming and Montana. The benthic, free-living oyster Texigryphaea was the dominant constituent of many late Albian marine communities in the Texas and southern Western Interior regions. Large topotypic assemblages of three common lower–middle Washita Group species (T. navia and T. pitcheri in Oklahoma and T. tucumcarii in New Mexico) each display considerable morphological variation in valve shape and the proportions and expression of various features. Variation within an assemblage is partly due to ontogenetic changes but is mainly ecophenotypic, with local variation in nature of substrate, water turbulence, length of attachment time, and other factors influencing the final morphology of the mature shell. Kingdom: Animalia Phylum: Mollusca Class: Bivalvia Order: Ostreoida Family: Gryphaeidae Genus: †Texigryphaea Species: †marcoui
  22. From the album: MY FOSSIL Collection - Dpaul7

    Texigryphaea marcoui bivalve SITE LOCATION: Mills County, Texas, USA TIME PERIOD: Lower Cretaceous (100-145 million years ago) Data: Gryphaea, common name Devil's toenails, is a genus of extinct oysters, marine bivalve mollusks in the family Gryphaeidae. These fossils range from the Triassic to the Tertiary periods, but are mostly restricted to the Triassic and Jurassic. Both periods belong to the era Mesozoic. They are particularly common in many parts of Britain. These oysters lived on the sea bed in shallow waters, possibly in large colonies. The complete fossils consist of two articulated valves: a larger gnarly-shaped shell (the "toenail") and a smaller, flattened shell, the "lid". The soft parts of the animal occupied the cavity between the two shells, just like modern oysters. The shells also feature prominent growth bands. The larger, curved shell sat within the mud on the sea floor. These shells are sometimes found in fossil plates along with Turritella, clams, and sometimes sharks' teeth and fossilized fish scales. Its distribution is common in areas of both Europe and North America. A classic location to find these fossils is Redcar, on the northeast coast of England. There used to be a common folk belief that carrying one of these fossils could prevent rheumatism. They are also found in abundance in the state of Kansas in riverbeds and cliffs as well as the Big Horn Canyon of Wyoming and Montana. The benthic, free-living oyster Texigryphaea was the dominant constituent of many late Albian marine communities in the Texas and southern Western Interior regions. Large topotypic assemblages of three common lower–middle Washita Group species (T. navia and T. pitcheri in Oklahoma and T. tucumcarii in New Mexico) each display considerable morphological variation in valve shape and the proportions and expression of various features. Variation within an assemblage is partly due to ontogenetic changes but is mainly ecophenotypic, with local variation in nature of substrate, water turbulence, length of attachment time, and other factors influencing the final morphology of the mature shell. Kingdom: Animalia Phylum: Mollusca Class: Bivalvia Order: Ostreoida Family: Gryphaeidae Genus: †Texigryphaea Species: †marcoui
  23. From the album: MY FOSSIL Collection - Dpaul7

    Ilymatogyra ram's horn oyster fossil SITE LOCATION: Del Rio, Texas TIME PERIOD: Lower Cretaceous (100-145 million years ago) Data: The Gryphaeidae, common name the foam oysters or honeycomb oysters, are a family of marine bivalve mollusks, and are a kind of true oyster. This family of bivalves is very well represented in the fossil record, however the number of living species is very few. All species have shells cemented to a substrate. Shells are considered brittle, inequivalve, with the left, lower (cemented) valve convex and the right (upper, non-cemented) valve flat or slightly concave. Kingdom: Animalia Phylum: Mollusca Class: Bivalvia Order: Ostreida Family: †Gryphaeidae Genus: †Ilymatogyra
  24. JohnJ

    Pseudodiadema aguilerai

    Found by John Jackson on April 13, 2013 in northern Comal County, Texas. This is a very uncommon echinoid species. NHM reference
  25. The specimen was collected by John Jackson on July 27, 2013 in northern Comal County, Texas. This is an extremely rare echinoid species. NHM reference
×
×
  • Create New...