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Showing results for tags 'silurian'.
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From the album: Misha's Silurian
Apopentamerus racinensis? Silurian Racine Formation Illinois-
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- brachiopod
- pentamerid
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From the album: Misha's Silurian
Lingula gibbosa Middle Silurian Waldron Shale Waldron, Indiana-
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- brachiopod
- inarticulate brachiopod
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Hi Everyone, Last month I took a trip from New York to Elizabethtown, Kentucky to attend my parents' 70th anniversary. My sister and her husband, two of her adult children, and my parents, both in their 90s have all resettled there. I try to visit them at least once per year, but my parents' 70th wedding anniversary could not be missed. It is a very long trip from the suburbs of New York City to E-Town and a stop along the way was the sensible thing to do, so I spent the night in Harrison, Ohio near the border with Indiana and only 15 minutes from St. Leon, the well known Ordovician roadcut. I've been there twice before. It is a huge outcrop, fossiliferous from top to bottom, with plenty to explore. With even a full day it is impossible to do justice to the site. As it was, I spent a half day. Most of you I'm guessing have been to or seen pictures of the roadcut. Here's a couple anyway:
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- bivalves
- brachiopods
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Over the last month or so, I've managed to get out to a few places. Although I can't say I've made stellar finds, I made out okay. In order of geologic sequence, I'll start off with the Ordovician. I have a spot in the Cobourg/Lindsay Fm that is typically very high energy, and so complete trilobite specimens are scarce. A few Isotelus parts, a Pseudogygites latimarginatus pygidium, a Ceraurinus marginatus glabella, and what may turn out to be a complete Flexicalymene senaria prone (to be determined after prep).
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- devonian
- ordovician
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Here's something I explore frequently. This is a section of the Niagara Escarpment in Central Wisconsin. It consists of Silurian aged sediments, predominantly dolomite and limestone formations. It extends for hundreds of miles and can be found as far from here as New York. This area is locally known as The Ledge, and is as treacherous as it is beautiful. People have actually died here, drawn in by The Ledge, only to stumble over. Caution is advised if visiting. I have navigated and explored this labyrinth like formation my entire life. However some depths I dare not travel to. This ladder pictured above, is the only human made structure I've found here. I have yet to see where it goes. If you ever run through Wisconsin, I highly recommend you look at our ancient attractions. The Ledge represents only the tip of the iceberg here in Wisconsin.
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Finally got around to joining up. Been collecting since second grade, and that was 67 years ago. Have some IDs needed, but will also start a gallery as time permits. Primary interest at the moment is Tennessee, USA Devonian as moniker announces. In general, HELLO!
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- devonian
- ordovician
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A while back I made a quick stop at a small exposure of the Waldron Shale (Silurian) in southern Indiana. I only picked up a couple of items but since I have not previously collected the Waldron, I wanted to confirm (or get the correct ID) on two small items. I'm hoping one of our Waldron experts such as @Herb, @Ken K, @crinus or @squalicorax or anyone else that has some Waldron knowledge can help me out. The first item is a small, nicely preserved brachiopod. Based on what I could find, I suspect it might be a Stegorhynchus but I wanted to confirm this and if anyone can add a species, that would be awesome. Alternately, if you have a good suggestion for reference material for Waldron brachiopods, I'd love to know it and would be happy to read up some more. The black bar in each picture is 1 cm. This little guy is 1.2cm wide, 1.1 cm long and 0.75 cm high. The second item is a crinoid holdfast with a very obvious pentastellate lumen. Its also hard to see in the picture (due to some matrix and some pyrite growth) but under the microscope, you can see that the articular surface has crenulae that extend from the outer edge all the way to the lumen. I can also see in edge view that the individual columnals are very thin. Again, the scale bar divisions are 1 cm. I know that Eucalyptocrinus is a common genus in the Waldron, but from what I can find, it does not have a pentastellate lumen, but admittedly most of the pictures I see of it do not show the columnal cross sections. I'm hoping one of our members is more familiar with this genus that I am (not too hard to do) and can confirm that for me. In looking through Moore and Jeffords (1968) CLASSIFICATION AND NOMENCLATURE OF FOSSIL CRINOIDS BASED ON STUDIES OF DISSOCIATED PARTS OF THEIR COLUMNS, I see they have a species identified as Cyclochorax fasciatus that fits the description (and age and formation) of my specimen (see #7 and 8 in the snippet below from their Plate 23) but after a quick search, the only reference I see for this genus is Moore and Jeffords. I'm wondering if anyone is familiar with what a calyx of this genus looks like or if anyone has knowledge of some other existing Waldron crinoid that has this columnal pattern. Look forward to any and all responses and any help that can be offered. Thanks Mike
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- brachiopod
- crinoid holdfast
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Hey everyone, I have this fossil I found along a beach when I was a kid. Unfortunately, I have no knowledge as to where I found it, other than it was an Ontario provincial park. I suspect it's a fish fin from either the Silurian or Devonian, but I want to get the thoughts of someone who knows more on fauna of this time. Thanks! Ps. There's a little something on the side of the rock that may help with id, it's in the second pic. Looks to me like a part of a plant.
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Fish got their jaws millions of years earlier than previously thought Meet the spiny, ancient Fanjingshania renovatais—likely the oldest discovered fish ancestor with jaws. Laura Baias, Live Science Ancient 'shark' from China is humans’ oldest jawed ancestor Palaeontologists discover a 439-million-year-old 'shark' that forces us to rethink the timeline of vertebrate evolution Chinese Academy of Sciences, Eureka Alert, October 3, 2022 The paper is: Andreev, P.S., Sansom, I.J., Li, Q., Zhao, W., Wang, J., Wang, C.C., Peng, L., Jia, L., Qiao, T. and Zhu, M., 2022. Spiny chondrichthyan from the lower Silurian of South China. Nature, 609(7929), pp.969-974. Yours, Paul H.
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- cartilaginous fishes
- china
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Silurian Eurypterus fossil has apparent symmetrical structures in Dorsal Cephalothorax
Biotalker posted a topic in General Fossil Discussion
I was fascinated by this eurypterid fragment from Ukraine because it has a rough symmetrical pattern on the dorsal surface of the cephalothorax. There is a midline structure with apparent tracts leading to the eyes and perhaps other structures (like downwards toward the abdomen). It doesn’t look like ventral appendages of the cephalothorax projecting dorsally. This has the appearance of some internal structure, fossilized with perhaps some part of the dorsal exoskeleton removed. While very unlikely, the tracts toward the eyes might lend some support an interpretation of a neural or neural structural component. This may very well be an artifact or perhaps someone has another explanation. The lighter two pictures have a light source from above while the darker three have a light source from the side to highlight the contours.
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- arthropod compound eye
- baltoeuryptus tetragonopthalmus
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From the album: Bertie Group fossils
This is far from a complete specimen, but it has most of the appendages, which is quite nice. From the Fiddlers Green Formation at Lang’s Quarry, given to me by a good friend.© Owen Yonkin 2022
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- bertie group
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From the album: Bertie Group fossils
This is a nice association piece showing a decent Eurypterus remipes along with an Acutiramus sp. telson. This piece is from the Fiddlers Green Formation at Lang’s Quarry, and was a gift from a close friend.© Owen Yonkin 2022
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I've recently come to acquire a collection of various fossils from the Silurian of Gotland. One of the larger specimens is this: My thinking is that this is 100% either a particularly large rugose coral, or an orthocerid. Could use some help.
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I couldn't quite bring myself to toss this out without checking. Is this something good ? I think it's from the Silurian Hardwood Mountain formation, but honestly I hadn't been treating it as very important.
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My First Trilobite: looks real or fake?
DapperDavo posted a topic in Is It Real? How to Recognize Fossil Fabrications
Hello, This is my first post. I recently purchased this item being sold as an authentic trilobite. It was in a box of about 12 and I purchased it cheap. If it's real, fantastic. If not, it's a minor loss. It is 3.75 inches/9.525 cm long. Please see the attached photos Thank you for all your help! Dave
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Found at work among crinoid, brachiopods, silicified corals as well as a possible cephalopod and some silicified stromatoporoids. Silurian SW Wisconsin. Looks kind of like a cartoon bone in shape
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Hunting the Niagara Escarpment in Hamilton, Ontario
JUAN EMMANUEL posted a topic in Fossil Hunting Trips
Hello guys, Summer is nearing its end so I decided to go and hunt the Niagara Escarpment of Hamilton, Ontario. The exposures I checked out at a creek ranged from the Cataract Group (early Silurian with the Whirlpool formation at its base and it sharply cuts the Queenston formation) all the way to the Clinton Group. Here is a pic of the Manitoulin formation, which is a part of the Cataract Group and is above the Whirlpool sandstone/formation. Above the Manitoulin formation is the mostly shale dominated Cabot Head formation. The Manitoulin and Cabot Head formations will contain fossils like this rock below. On these rocks one can find many small rugose corals and brachiopods. I move up stream to come across the base of an exposure with much rubble that comes from the Grimsby formation (Cataract Group) all the way to a portion of the Lockport Group. This stretch also covers the Clinton Group. A rock from the Rochester formation. This below is an interesting trace fossil as it reminds me of the Bergaueria trace fossils I used to find in the Georgian Bay formation of Toronto, Ontario. This one below belongs to the Cabot Head formation. If anyone thinks I should have kept this trace fossil, let me know what you think. New material is always falling at the base so it can be a nice ground to hunt for fresh material, even though some Silurian formations in this part of Ontario can be unfossiliferous. The creek ran on trickle since it is summer and made it easy to explore the creek. One of the finds I came across was this slab of pentameriid brachiopods (Pentameroides subrectus?) from the Reynales formation of the Clinton Group. In as much as I wanted to take home the entire slab of steinkerns, I decide to just smash it (as I am limited in space) to keep the more complete valves as finding nice complete valves from this formation is hard to find in my experience. But for real, this slab was also not eroded, had nice detail and would have made a nice display piece have I got the space. I also have the tendency to keep the best specimens I could get my hands on when I go fossil hunting at my locales. Here is a rock I decided to take home from the slab with at least two complete valves of pentameriid brachiopod. Here is one of the valves I took home from smashing the slab. Smashing the rock was hard and bits of it went flying as I tried to smash it up. The Reynales formation is mostly dolomitic limestone and these pentameriid brachiopods I took home also had pyrite on them.
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- cataract group
- clinton group
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Rochester formation rock with knobby form, could it be anything?
JUAN EMMANUEL posted a topic in General Fossil Discussion
Hello guys, I was out fossil hunting at the Niagara Escarpment of Hamilton, Ontario today and I came across this odd piece of Rochester formation shale (Clinton Group) with a knobby object on it. Could it be anything underneath all that shale or is it just my wishful thinking?? It also got some calcitic bits on the side too.
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I recently came across a new locality that exposes a calcareous section of the Red Mountain Formation. After braving poison oak, wasp attacks, swarms of gnats, and spiders, I've come out with some spectacularly preserved brachiopods, especially for this formation. I believe Dolerorthis sp.? Resserella sp. Not quite sure, looks like some kind of orthid. Leptaena sp. Another unknown orthid. A really well preserved Lingula sp. Slabs like this are fairly common, but the rock is so fragile it's difficult to get any back in one piece. The one piece in the bottom right caught my eye since it looks superficially like a Bumastus sp. fragment. Could be a brachiopod, though exposures I've found in similar rocks (also in the Red Mountain Formation) have turned up abundant trilobite remains, including Bumastus sp. Besides brachiopods, I've found a few other things. An interesting bryozoan? I'm not the best with colonial animals like this. A plate with several Hormotoma subulata(?) Hope you all enjoyed the photos! Please let me know if you think you have any IDs, I'm not too confident on some of these.
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Found in a small creek in southern Ohio, but no idea what it is.
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I found this in Ohio Brush Creek thinking it was horn coral. Its not. Any ideas? Part of a syphuncle maybe?
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Cephalopods Bivalves Brachiopods Gastropods Coral(wearing a sponge hat) Geodized sponge Geode
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- bivalves
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Hello Everyone!! I recently spent a week with Allan Lang collecting eurypterids. Me and Allan have been good friends for a couple of years, he is kind enough to invite me up to dig with him! We found many things over the course of the week some of the highlights were a Proscorpius, a few complete specimens of Acutiramus, and many Eurypterus. Ill attach some photos below. We spent most of the time splitting massive chunks of waterlime from the Phelps member of the fiddlers green formation. It can be very dangerous at times due to the weight and size of the rock, but often many complete eurypterids can be found in them. The Proscorpius was the most exciting find for me, The quarry has produced quite a few this year which is unusual as they are incredibly rare. It was a super fun time, I always love hanging out with Allan and collecting eurypterids at the quarry.
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- bertie group
- eurypterid
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I found this geodized fossil in Ohio Brush Creek here in southern Ohio. On the Adams/Highland co line. And about 3 miles west of the Serpent Mound impact crater. I've never seen anything like it before. It has a nodule, for lack of a better term, on the backside. It looks like it fits into something. There's also a part of a layer that is broken off in the back. Im at a loss here. I have no idea what I have here. If anyone can help identify I would be very grateful.
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From the album: Bertie Group fossils
This is a gorgeous little complete example of Eurypterus remipes. This specimen comes from Lang’s Quarry (Upper Silurian, Bertie Group, Fiddlers Green Formation, Phelps Member), and was a gift from a good friend of mine!© Owen Yonkin 2022
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