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Showing results for tags 'silurian'.
Found 196 results
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Due to the current instability of the cliffs, I headed west Sunday. @EMP helped me out with a ton of info, so I knew I could hit a few sites in one day. My dad and I drove to Allegany County and got to Hunting. I messed up the directions so probably didn’t get to the exact site, but I found a few exposures of mid-late Silurian material, probably McKenzie and Tonoloway formations mostly. The yield was a huge amount of ostracods, some brachiopods. My dad saw a strange rock so I climbed some talus and picked it up. Upon closer examination it had not only ostracods, but tentaculitids on it! Think that will be my IFOTM entry. My dad also found a beautiful calcite vug at one of the sites. I saw a bryozoan in one rock but I didn’t pick it up as the rock was too big. No trilobites, but for a few short stops not bad. I encountered some oriskany sandstone near as well, but as those who have hunted in it will know, it’s badly metamorphosed and almost never yields trilobites. After that, I continued to the conemaugh FM, a Carboniferous terrestrial unit. There was a water filled ditch right in front of the outcrop so I had to do some ninja moves over it here and there. The sandstone was mostly barren aside from a few fragments and the shake was too fragile to survive long but nonetheless I made it out with a few nice plant pieces. A day well spent, I returned home, fossils and a few good memories in tow. I haven’t taken many pictures yet, but I will. Here are a few to whet your appetite. Vug and worn ostracods and brachiopods from Tonoloway limestone
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Hello friends and TFF family! Another little palaeozoic problem. This was given to me back in the mid 1980s and was said to be from the Pentamerus Grits of Newlands, Girvan, Ayrshire, Scotland. Brrrrrrrr!!!!!! I have it marked down only as "Cystoid?" and it may well be. The hexagonal patterned bit down the edge of the rock including the smooth shell like piece is 2.2 cm long. Bad picture. Here is a better close up. You can kind of see above that the hexagons are lying on the surface of the smooth bit, which i once thought was a bit of Pentamerus oblongatus but now think it may be some sort of inner layer of the fossil to which the hexagons are attached. Clearer below : Any ideas would be most welcome! @piranha @TqB
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Hoooooooooooorrrrrrrrrrrraaaaaaayyyyyyyyyyy!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Here we are at last, into Adam's Silurian. Thanks for looking. First up is the Lower Silurian or Llandovery and I begin with a problem. I posted this one incorrectly in Adam's Ordovician as it had got it's label muddled up with an Ordovician Favosites I had that has vanished in the move here, but is being replaced by kind forum member @Herb Anyway, this, I remember now I've found the correct label, is from the greenish Browgill Formation, part of the Stockdale Group from a cutting near Skelgill (Skelghyll) in Cumbria, Northern England. It seems to be a tabulate coral, but I can't find any listed for this location, only mentions of small, rare, rugose corals. It has the star shaped corallites of a Heliolitidid, but seems to be tightly packed together like a Favositidid. A couple of species of Palaeofavosites seem to be close and are a bit star-shaped,, but anyone know any better? @TqB@piranha hmm who else? The coral bit, an external mold, is a maximum of 3.5 cm across and each corallite up to 2 mm.
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- leptostophiidae
- eostrophodonta mullochensis
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I found these two trilobites in an old collection and need some help. They are both labeled as Silurian from Glenridge Quarry at St Catharines, Ontario. They are listed as Gasport Formation. Before anyone gets too upset, they were collected pre 1991 as that is the date it was cataloged. So when these were collected, the site was either an active quarry or a garbage dump and not the park it is today. The first trilobite is obviously a Calymene. If anyone knows the species that would be appreciated. The second trilobite is what has be stumped. No clue as to what it is. It is just labeled as unknown with the locality information. Any clue out there??? Joe
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Hi, I went to St Paul, Indiana a couple weeks ago and was wondering what these two parts are? One is two inches across, the other is about an inch across. Trilobite parts? If so, what species? Thanks for any help.
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This past Saturday I was finally able to join ESCONI on one of their quarry field trips, this time to the Vulcan Manteno Quarry in Kankakee County, Illinois. After a relatively quick jaunt up I-57, I arrived at the quarry along with about 20 other enthusiasts, all clad in hard hats and neon safety vests. It is still an active quarry, although no mining was happening on that day, so the manager went over the rules with everyone- no climbing the rock piles, no getting too close to the high wall or the edge of the pit. Then we car-pooled down to the bottom of the quarry. The quarry exposes the Silurian Racine Dolomite Formation, and pile after pile of grey to orange colored rock was arranged on the quarry floor. It was hard to know where to start, so everyone wandered off to poke around and see what they could find. I didn't find much to begin, but after a little while I started noticing some interesting shapes, and within about an hour I had filled my bucket. I say "shapes", because I am not as familiar with this deposit as Mazon Creek, so my IDs for most of these only get as specific as "cephalopod" or "crinoid"- and in many cases more like "round organic-looking thing" . At the designated time everyone began heading back to the cars as a light drizzle came down- we only had about an hour and a half, but like I said, that was plenty of time to fill a 5 gallon bucket. It was an excellent trip, and I have to thank ESCONI and Vulcan for making it happen- I will definitely be signing up for the next one! My most interesting find is two associated partial impressions of echinoderms- the field trip leader suggested the one on the right was from Caryocrinites but he was not sure about the one on the left. I also found another small echinoderm piece, perhaps the base of a crinoid calyx?
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- racine dolomite
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UPDATE: This specimen has been identified by Steve LoDuca as Thalassocystis striata, a non-calcareous Silurian macroalga. Interestingly, the type specimen was found in the same general locality as my specimen. I have a friend who works in a Silurian dolomite quarry in Mich. He sent me this pic this evening. I have not examined the rock in person yet. The pessimist in me says mineral deposits. The optimist in me says maybe fossil algae. It's a long shot considering dolomitized limestone... but it sure looks interesting... thoughts?
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- silurian
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Hey everyone! I have some tiny trilobite pieces that I found at Wren's Nest in Dudley, UK while on a hunt last year with @JohnBrewer. I was wondering if they are identifiable. The tiny single piece is 5mm long, and the piece on the small plate is 3mm long. Age is Silurian. Thanks!
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From the album Invertebrates
Aulacopleura koninckii (Barrande, 1846) Silurian Wenlock Lodenice Liten Formation Motol Member Monograptus flexilis-Zone Czech Republic Hughes, N.C., Hong, P.S., Hou, J.B., & Fusco, G. (2017) The development of the Silurian trilobite Aulacopleura koninckii reconstructed by applying Inferred growth and segmentation dynamics: A case study in Paleo-Evo-Devo. Frontiers in Ecology and Evolution, 5(37):1-12 OPEN ACCESS PDF -
This was found in loose material falling from an exposure of Silurian aged The Forks turbidite. Carbonate nodules full of crinoid fragments are common in it, but what happened to this one ? I did notice what I assumed was volcanic intrusion nearby. I didn't give it much thought at the time, but it could be worth consideration. Photographed on snow. (still winter here )
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I wanted to complete drawings of all the reported Silurian Trilobites from Caleb's Quarry in Middleport, NY. I started late in December and finish today April 5th. Drawing was enjoyable, but got to be work towards the end. Top left to right: Arctinurus boltoni, Bumastus ioxus, Dicalymene sp., Calymene niagarensis,Decoroproetus corycoeus. Bottom left to right: Dalmanites limulurus, Dicranopeltis nereus, Illaenus insignis, Radnoria bretti and Trimerus delphinocephalus.
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- silurian
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From the album Trilobites
Rochester Shale Formation Middleport, New York, USA© 2018 by Jay A. Wollin
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Location: SE Portage County, Central Wisconsin, USA. Geology: South Western advance of Green Bay Glacial Lobe. Former Glacial Lake Oshkosh. Niagara Escarpment Debris. My land. Ordovician onward. Trying to learn, but am confused. I tentatively identified the below specimen as a Honeycomb coral, based on info from the below and input from local “experts”. None are Paleontologists, but one is a Natural History Museum Director. Begin quote: Favositid tabulates: Honeycomb corals The favositid corals are quite common. They usually formed large colonies. The corallite is prismatic in shape, resembling honeycombs. Favositids have mural pores, tiny holes in the wall of the skeleton, which connect different corallites. These pores are distributed in characteristic patterns and numbers, which are useful for distinguishing the various types of favositids. Favositids lived from the Ordovician to the Permian, at which time they became extinct. They are most abundant in middle Silurian to lower Devonian rock. Favosites is the most common fossil coral in Wisconsin. https://wgnhs.uwex.edu/wisconsin-geology/fossils-of-wisconsin/coral-gallery/corals/ Wisconsin Geological and Natural History Survey, UW Extension The confusing part is that some surfaces of this specimen show no pattern or regular form. Just like most of my finds. Are there any clues to indicate a rock of this structure may be a coral? Other than cutting it open? I have about 50 like this, but only two others show the typical pattern. The rest just have the “circles” on all sides. All are basically the same composition of material, but colors vary. All have inclusions of crystals. My vision is limited, so I only know what I have found after I wash it and look under a lighted magnifier with a loop. Photographing helps a lot as well. I just go on shape and colors when picking up. Then use a small hand held magnifying glass to examine. Sometimes wash off with a little water first. My son in law, who has (almost) a geology minor from local University, is amazed at what the glaciers “dumped” on my land. Note that a large part of the classes were related to local fossils, due to the abundance of them. Please let me know if my ID is correct, and any pointers for identifying specimens which do not show the structure, only the “circles” or “cavities”. Thank you. 1 2 3 4 5 6 7
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I thought I might draw a rare bug from my own Western New York area. The drawing is of the Silurian Lichid Trilobite: Dicranopeltis nereus. This particular fossil is a highly sought after specimen from the Rochester Shale; not many have been found in the renowned Caleb's quarry of Middleport, NY. Of all my drawings, this one took the longest because of all the little pustules covering the surface.
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- rochester shale
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Its been a long time since Ive posted any find on here, so I thought Id show some of what I collected during this past winter. I took a trip to the Silurian of Tennessee to collect with a friend and did pretty good. This was my first time collecting Silurian fossils. These are from the Brownsport Group. I'll start with the sponges Astraeospongia meniscus a fairly common sponge, I collected several. Next up is a neat little Brachiopod. Machaeraria sp. And now enchinoderms. Calyx of the crinoid Lampterocrinus tennesseensis Another first for me...a cystoid! Caryocrinites ornatus and another! A nice blastoid - Troosticrinus reinwardi Heres a shot showing the complete ones I found. The two large objects on the top left are sponges. The items with the branches may be bryozoans (one has a stem wrapped around it.) The crinoid cups to the right are Parapisocrinus sp. And the item by the penny is a tiny Leptaena sp. brachiopod (another first!) And now for my sole arthropod find. The surface is very rough, but it seems there is a mold under that. I may try to uncover it. The pygidium is folded down ninety degrees to the rest of it. Not sure as to id at this point. But it seems to be mostly there. I forgot to photograph the corals I found on this trip so I will add those this weekend. About a month ago I found myself very early for work so I decided to stop at the Pennington formation ( Upper Mississippian) for a quick hunt. I didnt keep much but I did snag this partial Deltodus affinis tooth. Thats all for now, thanks for looking.
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From the album Northern's inverts
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From the album Northern's inverts
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Took to pencil one of my favorite Trilobites, that just so happens to hail from my immediate area of Western New York. Arctinurus boltoni is a Silurian Lichid Trilobite from the Rochester Shale. I found my first Arctinurus on my first visit to Caleb's Quarry Midddleport on a field trip in 1995. A very lucky find it was. My drawing was done with 2B and 4B pencils on textured paper. I have included a picture of my real Arctinurus.
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This specimen recently came into my possession with the information given below. I have googled the information and come up with nothing about the trilobite. I believe the location information is correct as I did find some information on the Brandon Bridge Fm. and it does describe the matrix correctly. I also remember reading about this trilobite or something similar on this forum a while back but cannot find the topic. I would appreciate help with the ID of this trilobite. I am pretty sure it is quite rare and would love to add it to my collection. Dalmanitae sp. Brandon Bridge Fm., Joilet Group L. Silurian Waukaisa Co., Wisconsin This is all that came with the specimen. Joe
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Any ideas on this guys? I guess it's some type of bryozoa/bryozoan (dunno if it's one beast or lots of 'em) It's like an undulating mat. The 'mat' varies in thickness from, I guess, 2mm -5mm. The round things are in relief not indented. Era: Silurian Location: Wrens Nest, Dudley, UK @TqB
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DavMoly size:about 6,5 Mb B(ritish)G(eological)S(urvey)!! Lovely 3d images of some marker chitinozoa Mouthwatering,and nothing less. Thoroughly recommended NB I've never seen an uglier landscape than that of Wales editorial note:its content is not dissimilar to(below)
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- silurian
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From the album Trilobites
Cranidium. -
I picked up this weird fossil at the quarry in St Paul, IN last year, found as is: on the ground, split in half. It seems to be studded with crinoid holdfasts and bryozoan encrustations. Any ideas what it is? Under magnification it is a beautiful specimen. Also, I'm tempted to sand/polish one of the halves to possibly bring out some details. Would this be advisable? Thanks for any help.
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Eurypterid nervous auction. It's real?
Seguidora-de-Isis posted a topic in Is It Real? How to Recognize Fossil Fabrications
I participated in a nervous auction on our favorite auction site and I won the auction ... It seems like I was able to fulfill an old dream of having an Eurypterid for my collection. It's 100% real or is it painted or repaired somewhere? Is a good specimen? According to the seller, this is a fossil discovered in Ukraine, only this described in the advertisement and nothing more, so I thank you for any and all information you have about this specimen.
