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Showing results for tags 'Ordovician'.
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One of only a handful of the undescribed species, this specimen is unfortunately missing its librigenae.
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- neuville
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From the album: Trilobites
Taxonomy: Flexicalymene senaria (enrolled) Age: Ordovician - Katian (Verulam Formation) Location: Brechin, Canada Source: Field Collection Remarks: Damaged and a bit crushed as opposed to fully inflated.-
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From the album: Trilobites
Taxonomy: Isotelus gigas (enrolled) Age: Ordovician - Katian (Verulam Formation) Location: Brechin, Canada Source: Field Collection Remarks: Nearly complete save for a chip out of the pygidium.-
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A volcanic trigger for the Late Ordovician mass extinction? (Open Access PDF)
Oxytropidoceras posted a topic in Fossil News
Interesting open access paper on mass extinctions. Jones, D. S., A. M. Martini, D. A. Fike, and K. Kaiho, 2017, A volcanic trigger for the Late Ordovician mass extinction? Mercury data from south China and Laurentia. Geology v. 45; no. 7; p. 631–634 http://geology.geoscienceworld.org.libezp.lib.lsu.edu/content/45/7/631 http://geology.geoscienceworld.org.libezp.lib.lsu.edu/content/45/7 Yours, Paul H. -
Hi all, It's been a few years since I've posted here, but I'm hoping to bring some order to my fossil collection and prep some specimens for display. I've tried to glean info from other threads in this sub-forum, but am still trying to figure out how best to approach preserving/restoring Ordovician fossils. As a for instance, how would others approach this rock? It's a piece from southeastern Indiana and contains what I've tentatively identified as Tentaculites sterlingensis and some Flexicalymene pieces parts. Is there any way to make the Tentaculites pop out a little more and clean it up without breaking up the actual fossils? The rock is about the size of my hand. I like how others have given that glossy dark finish to Flexicalymene trilobites; can that be done here? Thanks for any tips you have and I apologize if this is not the right place to post this particular question. -Andrew
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Do you think this could be a partial edrioasteroid on a Hebritela brachiopo Found it today in Cincinnati. Ordovician period It looks like it could be one where the arms disarticulated
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On my way home from vacation, I wanted to swing by St. Leon to look for some small/ thin Ordovician hash plates, but due to an accident in the area, I decided to swing by the road cut in Lawrenceburg to get some. It was a very hot / sunny day, so I decided to not to spend a ton of time out there. Here are a couple pics of the area and a couple hash plates I collected and a part of a cephalopod.
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Lately if you have seen some of the topics I've started, these trips revolve around an Ordovician reef I came across by the Credit River in Mississauga, Ontario. One of the few things I discovered while exploring these spots is that there are plenty of Stromatocerium sponges which I red is a stromatoporoid. My question is, can anyone lead me to any papers about the growth forms of Ordovician stromatoporoids? I have found specimens of stromatoporoids and from the way I see it, some of the specimens I found of the same species have different growth forms. Some have those things they call monticules on the surface, and some don't exhibit them at all. Instead these specimens exhibit cracks and splits on the surface of the organism with irregular bumps and overgrowths. I'd like to know what causes this. Some of these sponges, from what I have collected, colonize some pieces of Prismostylus on the top.
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Well I was out hunting the Ordovician on Saturday and as it turns out I had a pretty awesome day. I found a plate with 5 flexicalymene trilos on it all essentially complete , a cyclocystoid complete with central plates, a partial piece of a cleiocrinus, a pleurocystites, a complete prone ceraurus with at least 5 small crinoid calyx on the plate, a bit mangled enrolled isotelus, a calyptalaux . You can see that fossils when they are found in the field are often nothing special to look at. Note that in the field I always circle what I am interested in with black sharpie marker (never leave home without one ) Many times I look at what I brought home weeks later and it really helps to know what caused me t carry it back to the car with me...... I also write the location and the date on the back because it is often weeks or months before I get to looking at them after getting home. However what got me excited was the rock 2nd from the top of this group but one that had just the faintest sign that it had something that looked like an echinoderm in it. Not much to look at and barely noticeable in the filed.All the pictures that follow are of approximately the same orientation as the original unprepped picture. Here it is under better light and closer up. After a while prepping I realized that I had something special Getting even more special Starting to look quite cool All done and the first ever Edriophus levis (Bather) for me and it is essentially complete. It is about 1 1/2 inches across. There were a few found a few years back but this is the first I have seen in quite a while. Not exactly common......`These are quite rare and are found in both the Bob Caygeon and the verulam formations of Ontario. Note that the arms curve clockwise which is one of the distinguishing features , Lebitodiscus curves counterclockwise. It would also appear that the arms go further down the sides than Foerstedicus. The anus is composed of 9 to 15 triangular plates which you can see broken up on this specimen. Really had no clue what it was when I found it in the field. I thought it was going to most likely be a crinoid calyx... Was a very nice surprise. As you can see from the last picture the specimen is sitting free on its original matrix. The reverse has also been prepped and is hollow with some plates visible. Unfortunately I did not take a picture of the underside yet. Maybe will try to do when I get a chance. But have a lot of really neat material under prep right now ... have spent 10 hours a day prepping material in the last few days ... If I can keep up the pace for a few weeks I can start to get my head above water.......
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Highway cut, topped with Ft Payne formation, Leipers, Catheys, Bigby Cannon, Hermitage formations Recently "cleaned-up" by TDOT, followed by 2 gully washers leaving new bottom rock exposed.
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Found some nice bryozoan assemblages, also found crystalized interior of something. Cephalopods often have that crystal formation interior. The right pict also has some gastropods.
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I had some luck the other day poking around a creek in Jefferson Co Kentucky (Ordovician) I was told there might be some trilobites in the area, so I went back after a rain to look around. I found a bunch of weird stuff, but this looked the most promising. Is it a nautilus? Thanks as before for the help.
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Hello, I am a middle school teacher and have been collecting fossils and minerals for a number of years. Most of my collection is primarily Pennsylvanian and Mississippian fossils collected within a few hours of B'ham. I am eager to learn from this group in order to identify and catalog my specimens more accurately and also expand my collecting areas with groups outside central AL. I appreciate your patience in advance for some of the specimens I have questions about since I have not developed a great skill in prepping my finds as yet. Thank you for allowing me the opportunity to be part of this community.
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Hello from Cincinnati! I'm new here and just wanted to say hi. I'm currently a Geology student at the University of Cincinnati. We have a plethora of Late Ordovician aged fossils in my area which allowed me to easily explore my passion for fossils early in life. I look forward to learning from all of you on this forum.
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Hello, I'm new to fossil hunting and to this forum, so my apologies for the very basic (and potentially ill-formatted) question. I recently got access to a friend's property near Louisville Kentucky that is pretty lousy with brachiopods. Had a lot of fun exploring, but I also found some fossil-like structures that didn't look like shells. Any chance you can help me identify one of them? Assuming this is like the rest of Jefferson County the material is Grant Lake Limestone. The fossils are Ordovician (all sea floor material). This piece in question stood out because it's dark like the fossils (which are easy to spot against the otherwise light brown matrix), but didn't look like the rest. It was found on the banks of a very small creek (that is mostly moving during rain storms). The mystery in question is the dark rectangular bit. The others are clearly brachiopods. Thanks for looking! I'm trying to get as much info as I can before I head out again.
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Amecystis laevis (Ulrich and Kirk, 1921). Upper Bobcaygeon Formation, Middle Ordovician. Simcoe County, Ontario, Canada. This specimen is among the ten specimens on a hash plate that was won in a bid and bought over online auction site. The specimen is missing the two tentacles at the top of the head. Length of the specimen was measured by using a measuring tape.
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- bobcaygeon formation
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Lingulichnus verticalis (Hakes, 1976). The elliptical shaped and concave burrows or holes were made by a linguloid brachiopod burrowing in the sediment. I took this plate home as I have never seen so many Lingulichnus burrows on one plate. Rock is limestone and was most likely mud before it lithified. Bibliography: Systematic Ichnology of the Late Ordovician Georgian Bay Formation of Southern Ontario, Eastern Canada, 1998, by D. Christopher A. Stanley and Ron K. Pickerill
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Quoted from the excellent ukfossils.co.uk website below, to help describe these fossils found forty years ago and currently going through some much needed TLC from team DE&i “These graptolites (pictured above) Didymograptus murchisoni are from Abereiddy Bay, Pembrokeshire in Wales and they are a species known as the ‘tuning-fork’ graptolite. They existed for only a relatively short period of time, during the latter part of the Middle Ordovician, about 470 to 464mya. Therefore, it used as an index fossil for this period of time, which geologists refer to as the Llanvirn stage 9 after a farmer’s cottage on the lane leading to Abereiddy).” Now judging by the paragraph above and the newspaper pages that this large box of shale’s was carefully wrapped in. You kind of get this sense of wonder, for some further interesting, perhaps not so apparent fossils that theses shale’s could contain. I’ve excitedly established that there is indeed hundreds of Didymograptus murchisoni graptolites packed into these shale’s. Continued in reply :
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From the album: Credit River Fossils from Streetsville, Ontario (Georgian Bay Formation, Upper Member)
Prismostylus sp. found near Streetsville, Missisauga, Ontario by the banks of the Credit River. Top view of specimen. Georgian Bay Formation, Streetsville Member, late Ordovician, Katian. Formerly called Tetradium, this algae was very common to find in the locality I found this in. Small fragments of this algae can be observed on the limestone but I have seen some specimens that are wider than 20-25 cm in diameter. This specimen is a fragment and is around 15 cm at its widest point. -
Side Views of the Prismostylus sp. Specimen
JUAN EMMANUEL posted a gallery image in Member Collections
From the album: Credit River Fossils from Streetsville, Ontario (Georgian Bay Formation, Upper Member)
Side view of the Prismostylus sp. specimen. Credit River near the Streetsville area, Mississauga, Ontario. Georgian Bay Formation, Streetsville Member. Late Ordovician. -
As I wade through the boxes of fossils I collected as a kid and try to make heads or tails of what everything is, where it was collected, and whether it is worth keeping or giving away, I've hit a road block with cephalopods. It seems cephalopod identification hinges largely on internal features that are not always accessible/preserved. I'm trying to figure out what I can and cannot identify and also what I am trying to look for. I've got two examples below; the smaller one is from Ripley County Indiana and is either from the Liberty or Waynesville Formation (I believe) of the Richmondian stage. Looking at it, I was thinking the small circle visible on both the anterior and posterior end is the siphuncle. If this is true, it looks to be ventral which would make this Cameroceras? Am I on the right track and can I get it down to species possibly? The second, larger fossil is from Franklin County Indiana and is also from either the Waynesville or Liberty Formations of the Richmondian. Based on the shape, it seems like this is an Oncocerid cephalopod and I'm torn between Diestoceras and Beloitoceras. Once again, am I in the right ballpark and can this be narrowed down any more given the condition of the fossils? I'm interesting in learning what features everyone is looking at in identifying cephalopods and what kind of preservation is needed to get to at least the genus level so I can apply the approach my other cephalopod fossils. Thanks for any help you can provide! -Andrew
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I am hoping someone out there is extremely familiar with the surface texture of late Ordovician trilobites of the Cincinnatian. I found this in St. Leon, Indiana. I believe it is a trilobite glabella, and there might be a little bit more to expose. Normally I wouldn't get excited about a trilobite fragment, but finding anything other than Isotelus or Flexicalymene at this site is a bit rare, and this could add a new taxon to my collection for that site. Taxa that I thought might be candidates include: * Ceraurus milleranus * Amphilichas shideleri * Tricopelta breviceps Thanks for any help. (scale is in mm)
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I had an hour to spare today and decided to do a quick prep on a partially enrolled Flexicalymene retrorsa minuens that I got last month from St. Leon, Indiana. I have a number of these packed away as specimens for science, so I convinced myself it was ethically okay to go Moroccan on this one and build a fake pedestal on some matrix from the site to make it easier to handle and more aesthetic to display (as you can see, it was loose from the matrix when found). I used a pin vice, air abrasion, and a light coat of Butvar (to help prevent the exoskeleton from popping off). I didn't take great pains to make it perfect, obviously "Before photo": After photos:
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Endoceras proteiforme with Endocone Speiss
JUAN EMMANUEL posted a gallery image in Member Collections
From the album: Urban Fossils of Toronto (Georgian Bay Formation, Lower Member)
Endoceras proteiforme (Hall, 1847) with a conical endocone speiss. Found in Mimico Creek, Toronto, Ontario. Georgian Bay Formation, Humber Member, late Ordovician, Katian. Length is approximately 2 feet long. This specimen is a fragment of the larger body. -
found this the other day and cleaned it up a bit
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