Search the Community
Showing results for tags 'late cretaceous'.
-
Sphenodiscus lenticularis ammonite and other shell fossils in a shale matrix
xraymike79 posted a topic in Member Collections
Sphenodiscus lenticularis ammonite From the late Cretaceous, Maastrichtian stage Fox Hills Formation, South Dakota
- 16 replies
-
- 8
-
-
- fox hill formation
- late cretaceous
- (and 2 more)
-
The Aguja micro vertebrate assembladge is quite diverse. I've attached a few of my finds some identified some misidentified , some unknown . Lots still to identify and photograph so I will keep adding to this topic. Apologize for the quality of photos need to invest in a better digital scope to obtain crisper photos of these tiny specimens. Material is Campanian in age from Texas Dinosaurian Actinopterygii Additional Teeth Amiid Fish Tooth Below, Lepisosteid Tooth Top Chondrichthyes
- 12 replies
-
- 7
-
-
- aguja formation
- late cretaceous
- (and 1 more)
-
I see a tooth being sold as Aublysodon and the seller also states it could be another juvenile tyrannosaurid My understanding is that this is not a valid species correct. Tooth is around 1/2 "
.jpg.61f6d60442acafc3af60f8f0de0059dd.jpg)
.thumb.jpg.2bd763e30deae1b84a5be3c12329b13f.jpg)
-
Was just in the Ramanessin Brook today looking for shark teeth and stumbled upon this interesting fossil. I have never seen anything like this. Could it be a possible vertebrae from a marine mammal or late Cretaceous marine species?
-
The Dino Project is a scientific, educational and cultural unit of the National University of Comahue and aims to rescue from the rock all the dinosaurs and other animal and plant remains that inhabited the Barreales Lake area 90 million years ago. This is the only Earth Ecosystem of the Upper Cretaceous of South America and it is considered a hole in Geological time to see the past. The field work involves the extraction, preparation, study and exhibition of the fossils found in the same site. On the other hand, it is an objective of the project to disseminate this activity at all levels of society and education in order to learn to value our heritage and the effort involved in carrying it forward. For more info their website http://www.proyectodino.com/ Location north coast of Lake Barreales, in the province of Neuquén Findings include Some Photos provided by Jorge Orlando Calvo Complete manus of Megaraptor namunhuaiquii Several Sauropods have been found including the Titanosaur Futalognkosaurus dukei Vertebrae Now this is a vertebra Another of the theropod dinosaurs represented by a pubis, ileum (bones of the hip), humerus, claw and a dorsal vertebra is Unenlagia paynemili . This carnivore is very important in the evolution of dinosaurs and birds since it represents a true link between both groups. The holotype of Macrogryphosaurus gondwanicus. One of The biggest ornithopod in South America. In addition, more than 300 teeth have been found with different types of "saws" from at least 5 different species of theropods
.thumb.jpeg.ecd1ceaab956277e467210946dc9bfc2.jpeg)
- 8 replies
-
- 6
-
-
- argentina
- dinoproject
- (and 2 more)
-
Hey everyone, I would like your opinion on this interesting vertebra (from the NJ Late Cretaceous). I identified it a long time ago as a first cervical vertebra from either a ray or an angel shark. An expert looked at some pictures and thinks it is a batoid first cervical vertebra. Sorry about the picture quality, these are old photos. Thanks for any help!
-
Better pictures of possible dinosaurian teeth from flints of Lithuania
D.N.FossilmanLithuania posted a topic in Fossil ID
Dear Guys, I recently photographed these small reptile teeth with maximum contrast and got quite good pictures. They are already sent to dinosaur specialist but until I wait for an answer I would like to dicuss about these finds judging by better picture qualities. The first tooth from three sides (2.7 mm length):
-
Dear Guys, I recently prepared one bigger tooth I have found in flint erratic, it is 1 cm length, crimson and little curved with blunt upper end unusual to shark. The edges are little serrated but I wouldn't expect dinosaur. However, I think it is also not from bony fish and the serrations look more reptile like. Plesiosaurs and elasmosaurs have quite rounded cross section in teeth, so maybe it is from Pachyvaranus, etc.? Any idea what is this? Best Regards Domas
-
Good evening Guys, Today I splitted some flint erratics in gravel and except some fish remains founde this tooth. It is straight in sculpture, 5 mm length, serrated edges are not visible and its vertical groove texture is irregular what makes me think it does not represent fish. I would say it is baby mosasaur or very small mosasaur species, but I want to find out which taxon would be the most correct for this find. If you see features typical to known reptile or other vertebrate group, please let me know. Any help will be appreciated! Best Regards Domas
-
I just bought a large, fairly well preserved vertebra from a rock shop in Tucson. It was found in the Aguja Formation in Texas, a formation that isn’t especially well researched. My diagnosis is that the vert is most likely theropod, and the only theropod that large that is in the area and comes to mind for me is the Acrocanthosaurus. This diagnosis is leaving me skeptical. Acro bones are pretty rare to my knowledge (there are only 5 articulated specimens discovered as of now), and I don’t see any documentation of them being found in Aguja, though as I said before it is not well researched. My only other theories are that this is from a Kritosaurus (which seems unlikely based on the size and shape), or that it is some other saurischian that isn’t documented in the formation yet. If I could at least get verification that it is theropod that would be very nice. This purchase will either have been a pretty good deal, or an absurdly amazing one. We’ll see, and thanks for helping! Bone is 6.75” long, 4.5” wide at widest point, and 4.75” tall at tallest point.
-
Hello! I found a mysterious fossil bone while looking for shark teeth in NE Mississippi this past weekend. I believe it is from the Eutaw Formation which is Late Cretaceous. This bone appears to be complete, although maybe a bit creek-worn. It is as hard as a chert creek rock with visible minerals present in the pores. Size is 2.75" long, by 2" wide, and around 1.5" thick (including the arches on the other side). I have not studied vertebrates, and have no idea how to technically describe bones, but it looks like the largest surface is a ball (like a ball/socket) and there are two areas on either side that look like contact points. If you turn it over, it is almost heart-shaped with another ball-type surface at the bottom of the "heart shape" and two concave areas on the sides (lots of mineral "stripes" in this area). At the top of the heart shape, there is a dovetail-shaped notch. I am more than happy to take additional photos if requested! I've scoured Google and can't find much to go by, but I am guessing that it is probably some kind of marine reptile or less likely, a dino that had washed out to sea. I know it is a stretch to be able to identify one lonely little bone, but I would love to know anything I can about it, no matter how general. Thanks everyone!!!
- 9 replies
-
- 1
-
-
- bone
- eutaw formation
- (and 3 more)
-
Last Sunday I stopped at an outcrop of the Maastrictian (late Cretaceous) Prairie Bluff Chalk in western Alabama. About 3 meters below the top of the formation I encountered this tooth. It was definitely in situ, I had to chisel it out. It's 2.1 cm long, 1.6 cm wide at the base, and 0.7 cm thick at the base (so quite flat). Despite some cracking the tooth is not distorted, it is actually flattened not compressed during fossilization. One face is almost flat, and the other is curved. Both sides are serrated until very close to the tip; there are 5-6 serrations/mm. I have an idea of what this tooth is, or what I want it to be, but I have never collected one before so I'd like to get more experienced opinions. One thing that is confusing about this, the Prairie Bluff is a fully marine formation, deposited well offshore in moderately deep water. Associated fauna included a diverse array of marine bivalves, gastropods, echinoids, cephalopods (heteromorph ammonites including baculitids, Hoploscaphites, Discoscaphites, and Diplomoceras, as well as coiled nautiloids), and very scarce shark teeth, so it was definitely a fully marine environment. So, what do y'all think? Don
-
A very rare new discovery: The North Carolina Museum of Natural Sciences reported today that a clutch of oviraptorosaur eggs was found in the San Rafael Swell of Utah. It was a first for the North American continent since these ars typically found in Asia. NC Museum release with video http://naturalsciences.org/calendar/news/rare-dinosaur-eggs-discovered-by-n-c-museum-of-natural-sciences-paleontologist/ @HamptonsDoc @-Andy-
- 6 replies
-
- 7
-
-
- late cretaceous
- north carolina museum of natural sciences
- (and 2 more)
-
Hi everyone, I am new to fossils and have got hold of a Tyrannosaurus Rex from someone I know. The tooth was found in Hell Creek Formation, Faith, South Dakota USA and is 2.5 inches in length and the teeth itself is really heavy (pics attached). Let me know if you need me to take clearer photos of serrations as it is quite hard as my camera's macro focus doesn't work very well. As you can see from the pics this teeth has some surface wear to the enamel and serrations... Serrations worn may have been from feed wear. Please can you help me identify if its from the Tyrannosaurus Rex as opposed to one of the members like the Nanotyrannosaurus or Carcharodontosaurus? Thank you! Jai
-
A very brief article about the "Chicken from Hell" Anzu wyliei found in the Hell Creek Formation. Added some of my photos to get a better view of this cool Dinosaur. Carnegie Museum Article http://carnegiemuseumnaturalhistory.tumblr.com/post/165688152585/anzu-wyliei-perhaps-better-known-by-its-colorful/amp?__twitter_impression=true 5 feet high at the hips. Hand Claws reached 7 inches long
- 5 replies
-
- 2
-
-
- anzu wyliei
- hell creek formation
- (and 1 more)
-
Documented in this paper is baby hadrosaur that represents the first occurrence of an articulated nestling dinosaur skeleton from the latest Cretaceous (late Maastrichtian) of North America. It's from the Hell Creek of Montana, Garfield County. Edmontosaurus annectens Red... Scapula Purple.. Vert column Green..Pubis Blue.. Femur & Tibia Journal of Vertebrate Paleontology. ....Paywalled for non members.. A nestling-sized skeleton of Edmontosaurus(Ornithischia, Hadrosauridae) from the Hell Creek Formation of northeastern Montana, U.S.A., with an analysis of ontogenetic limb allometry Mateusz Wosik,Mark B. Goodwin &David C. Evans http://www.tandfonline.com/doi/abs/10.1080/02724634.2017.1398168?journalCode=ujvp20#.Wog2CXWObFg.twitter
- 11 replies
-
- 7
-
-
- edmontosaurus
- hell creek formation
- (and 2 more)
-
Looks like students of UNLV found bones of dinosaur which are now being studied by the Las Vegas Natural History Museum. The bones appear to be that of a hadrosaur and if named would be a first for Nevada News report attached and check out video in that report http://news3lv.com/news/local/new-dinosaur-species-discovered-in-valley-of-fire
- 4 replies
-
- 2
-
-
- hadrosaur
- late cretaceous
- (and 1 more)
-
Dear Guys, I recently collected three examples of interesting small bones that have the cavities in the same area, I found them in flint erratics of South Lithuania. One scientist (Jens Koppka) told be that one time the occasional bird bone in flint was found by his colleagues in Lithuania. I recenly found the link with very similar shape of bone known as Enantiophoenix in the middle picture of one publication that I share with you now : https://peerj.com/articles/1032/ Open this link and look for "Comparison of scapulocoracoid between the dromaeosaurid Balaur and other paravians", the cavity in the second scapulocoracoid picture is named as "snf". Please look at my fossil pictures and this link and help with confirmation if you could. Best Regards Domas
-
Hello, I came across this piece in a rock/fossil shop during a recent road trip. It was labeled as unidentified dinosaur vertebrae - late Cretaceous 66 million years ago - from the Fort Crittenden Formation in Arizona. I bought it because it's an interestingly shaped piece - any thoughts or ideas? Neck, tail, or back? Thank you for your help.
-
From the album: MY FOSSIL Collection - Dpaul7
Inoceramus Bivalves SITE LOCATION: West Point, Nebraska, USA TIME PERIOD: Late Cretaceous (75-100 Million Years Ago) Data: Inoceramus (Greek: translation "strong pot") is an extinct genus of fossil marine pteriomorphian bivalves that superficially resembled the related winged pearly oysters of the extant genus Pteria. They lived from the Early Jurassic to latest Cretaceous. The taxonomy of the inoceramids is disputed, with genera such as Platyceramus sometimes classified as subgenus within Inoceramus. Also the number of valid species in this genus is disputed. Inoceramids had a thick shell paved with "prisms" of calcite deposited perpendicular to the surface, which gave it a pearly luster in life. Most species have prominent growth lines which appear as raised semicircles concentric to the growing edge of the shell. Paleontologists suggest that the giant size of some species was an adaptation for life in the murky bottom waters, with a correspondingly large gill area that would have allowed the animal to survive in oxygen-deficient waters. Kingdom: Animalia Phylum: Mollusca Class: Bivalvia Order: †Praecardioida Family: †Inoceramidae Genus: †Inoceramus -
From the album: MY FOSSIL Collection - Dpaul7
Inoceramus Bivalves SITE LOCATION: West Point, Nebraska, USA TIME PERIOD: Late Cretaceous (75-100 Million Years Ago) Data: Inoceramus (Greek: translation "strong pot") is an extinct genus of fossil marine pteriomorphian bivalves that superficially resembled the related winged pearly oysters of the extant genus Pteria. They lived from the Early Jurassic to latest Cretaceous. The taxonomy of the inoceramids is disputed, with genera such as Platyceramus sometimes classified as subgenus within Inoceramus. Also the number of valid species in this genus is disputed. Inoceramids had a thick shell paved with "prisms" of calcite deposited perpendicular to the surface, which gave it a pearly luster in life. Most species have prominent growth lines which appear as raised semicircles concentric to the growing edge of the shell. Paleontologists suggest that the giant size of some species was an adaptation for life in the murky bottom waters, with a correspondingly large gill area that would have allowed the animal to survive in oxygen-deficient waters. Kingdom: Animalia Phylum: Mollusca Class: Bivalvia Order: †Praecardioida Family: †Inoceramidae Genus: †Inoceramus -
From the album: MY FOSSIL Collection - Dpaul7
Inoceramus Bivalves SITE LOCATION: West Point, Nebraska, USA TIME PERIOD: Late Cretaceous (75-100 Million Years Ago) Data: Inoceramus (Greek: translation "strong pot") is an extinct genus of fossil marine pteriomorphian bivalves that superficially resembled the related winged pearly oysters of the extant genus Pteria. They lived from the Early Jurassic to latest Cretaceous. The taxonomy of the inoceramids is disputed, with genera such as Platyceramus sometimes classified as subgenus within Inoceramus. Also the number of valid species in this genus is disputed. Inoceramids had a thick shell paved with "prisms" of calcite deposited perpendicular to the surface, which gave it a pearly luster in life. Most species have prominent growth lines which appear as raised semicircles concentric to the growing edge of the shell. Paleontologists suggest that the giant size of some species was an adaptation for life in the murky bottom waters, with a correspondingly large gill area that would have allowed the animal to survive in oxygen-deficient waters. Kingdom: Animalia Phylum: Mollusca Class: Bivalvia Order: †Praecardioida Family: †Inoceramidae Genus: †Inoceramus -
From the album: MY FOSSIL Collection - Dpaul7
Inoceramus Bivalves SITE LOCATION: West Point, Nebraska, USA TIME PERIOD: Late Cretaceous (75-100 Million Years Ago) Data: Inoceramus (Greek: translation "strong pot") is an extinct genus of fossil marine pteriomorphian bivalves that superficially resembled the related winged pearly oysters of the extant genus Pteria. They lived from the Early Jurassic to latest Cretaceous. The taxonomy of the inoceramids is disputed, with genera such as Platyceramus sometimes classified as subgenus within Inoceramus. Also the number of valid species in this genus is disputed. Inoceramids had a thick shell paved with "prisms" of calcite deposited perpendicular to the surface, which gave it a pearly luster in life. Most species have prominent growth lines which appear as raised semicircles concentric to the growing edge of the shell. Paleontologists suggest that the giant size of some species was an adaptation for life in the murky bottom waters, with a correspondingly large gill area that would have allowed the animal to survive in oxygen-deficient waters. Kingdom: Animalia Phylum: Mollusca Class: Bivalvia Order: †Praecardioida Family: †Inoceramidae Genus: †Inoceramus -
From the album: MY FOSSIL Collection - Dpaul7
Inoceramus Bivalves SITE LOCATION: West Point, Nebraska, USA TIME PERIOD: Late Cretaceous (75-100 Million Years Ago) Data: Inoceramus (Greek: translation "strong pot") is an extinct genus of fossil marine pteriomorphian bivalves that superficially resembled the related winged pearly oysters of the extant genus Pteria. They lived from the Early Jurassic to latest Cretaceous. The taxonomy of the inoceramids is disputed, with genera such as Platyceramus sometimes classified as subgenus within Inoceramus. Also the number of valid species in this genus is disputed. Inoceramids had a thick shell paved with "prisms" of calcite deposited perpendicular to the surface, which gave it a pearly luster in life. Most species have prominent growth lines which appear as raised semicircles concentric to the growing edge of the shell. Paleontologists suggest that the giant size of some species was an adaptation for life in the murky bottom waters, with a correspondingly large gill area that would have allowed the animal to survive in oxygen-deficient waters. Kingdom: Animalia Phylum: Mollusca Class: Bivalvia Order: †Praecardioida Family: †Inoceramidae Genus: †Inoceramus -
From the album: MY FOSSIL Collection - Dpaul7
Petrified Wood SITE LOCATION: West Point, Cumings, Co., Nebraska, USA TIME PERIOD: Late Cretaceous (75-100 Million Years Ago) Data: Lake Superior Agate - Petrified wood (from the Greek root petro meaning "rock" or "stone"; literally "wood turned into stone") is the name given to a special type of fossilized remains of terrestrial vegetation. It is the result of a tree or tree-like plants having completely transitioned to stone by the process of permineralization. All the organic materials have been replaced with minerals (mostly a silicate, such as quartz), while retaining the original structure of the stem tissue. Unlike other types of fossils which are typically impressions or compressions, petrified wood is a three-dimensional representation of the original organic material. The petrifaction process occurs underground, when wood becomes buried under sediment or volcanic ash and is initially preserved due to a lack of oxygen which inhibits aerobic decomposition. Mineral-laden water flowing through the covering material deposits minerals in the plant's cells; as the plant's lignin and cellulose decay, a stone mold forms in its place. The organic matter needs to become petrified before it decomposes completely. A forest where such material has petrified becomes known as a petrified forest. Kingdom: Plantae
.jpg.61f6d60442acafc3af60f8f0de0059dd.jpg)
.jpg.bdee98922de798842e982da7e553397d.jpg)
.jpeg.616c5f93441922af1e8ddfe9b20bd0ab.jpeg)
