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Showing results for tags 'silurian'.
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Found in SE Michigan, but likely moved there by man as it was in my mothers new condo flower garden. Approximately the size of a grapefruit. Spheroid with a mushroom shape with the bottom "stem" area not having any of the corallite tubes. Originally thought it was a Petoskey stone, but after cleaning it up (hosing the mud off it) I cannot see any separation between the tubes, and I have never seen a Petoskey with such far separation of the openings and without a very clear hex shape. Matter of fact, I cannot see any joint between the openings at all. The other types of corals from the area I am familiar with (horn, Charlevoix, and chain corals) it is clearly not one of them. Any help at an ID would be appreciated. Will try to post a couple other pic's below, hit the size limit with this post.
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Found this peculiar pattern on a rock containing other fossils from Northern Illinois, from the Silurian period best I can figure. Haven’t seen the like before. Anyone know what it might be?
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Any help with identification of the following attached Bryozoans would be greatly appreciated. 001: Collected from Bungonia NSW Australia and is Upper Silurian in age. 002: Collected from Bowning NSW Australia and is Upper Silurian in age. (possibly a Penniretepora sp.) 003: Collected from Bowning NSW Australia and is Upper Silurian in age. and again, thank you for any help given.
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I found all the crinoids below at Lake Michigan beaches in Illinois. (Silurian, Racine formation) I have to admit, I used to not pay too much attention to the ubiquitous crinoids on my hash rocks. That is, until I started to look at them with a clip-onto-the-phone microscope. I quickly found that crinoid disks aren't all the same and are actually quite beautiful and intriguing. Also, finding a pretty little crinoid calyx at the beach got me to look for more like it and low and behold, a short time later, I did find another one. I do believe they are very rarely found at Lake Michigan beaches, unlike the ubiquitous petoskey stones or honeycomb corals. So I've been trying to research Silurian crinoids from this formation, alas with very little success. Oh, for the lucky people who find Devonian crinoids, bibles have been written about those, I'm so jealous! So I'm turning to TFF once more to hopefully find additional information. Is anyone here familiar with Silurian crinoids from the Wenlock epoch? Is it possible to narrow down ID of at least some of these even though I don't have a single stalk or stem segment with the calyx and vice versa. # 1: Maybe a Crotalocrinites or similar? I'd love to know what its calyx looks like. Love the flower shaped lumen, it's so pretty! For comparison, this is a pic of Silurian Crotalocrinites from the British Geological Survey: I'm not 100% sure that they occur in the Racine formation though. Also, the lumen takes up more space within the disk than the lumen on my specimen above. Otherwise the flower shape seems a perfect fit, but hard to tell if the crenolae under the dolomite glaze on my piece are as fine and tightly spaced. Maybe a it's a close relative? #2: I haven't found a single image or description of a crinoid stem that looks like a perfect medieval tower. Anyone here that's familiar with such patterned crinoid stems? (Love the Danish pastry look on its top and bottom too) #3: I assume this poor crinoid was parasitized by some other live form? I know that brachiopods have been found attached to crinoid stems, as illustrated on Chicago's Field Museum work-in-progress website. But I don't think that's what happened to this one. What could have caused such extensive damage? #4: I think this one does have a cirri scar on its left side below. Detail of what I think is the scar in the 2nd pic. The following stem disks are all microscopic in size, less than 5mm: #5: I hope the lovely star-shaped lumen might make it identifiable. #6: Same as for the above, the ship's wheel lumen surely should help with ID? #7: Another Crotalocrinites or similar? Flower shape seems a bit different though, assymetrical. #8: I've found quite a bit of literature about star shaped jurassic crinoid columnals/ossicles, but nothing about Silurian ones. This one, sitting in limestone actually has the widest diameter of all columnals in my collection. Ø = 1.5cm. #9: First calyx. I think this one is very nicely preserved. Ø1cm and height: 1cm. Is it possible to narrow down its ID, despite missing the stem and arms? Also, in most images of crinoid calyces, the brachials visibly grow out of the side of the calyx. Not so with this one. Would they have grown out of the top side by side with its mouth and anus? #10: Second calyx. It's a bit larger, about 2cm wide and 1.5cm tall. Not sure what its original shape used to be, as it's been tumbled and worn and seems to be missing parts on its side. The top is hidden in matrix.
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There have been some great reports in the last week of folks hunting the Silurian and I wanted to add a report for my own serendipitous mini-trip from the last weekend. A few months ago, I had noticed a large pile of buff-colored stone dumped next to a retention pond in front of a local retail district. I thought they looked very similar to the Silurian dolomite I have seen and collected from elsewhere in Illinois, so I have been meaning to take a closer look. Last weekend I finally had some errands to run at Target with some free time on my hands, so I wandered over to the pile to check it out. In less than a minute I spotted a friendly face poking out of the corner of one piece of stone- Gravicalymene celebra! An iconic trilobite, and the biggest one I have found, with a cephalon just over 1 inch wide. It looks like it may be complete, although prep can be very difficult as @aek mentioned recently- at a minimum the cephalon appears to all be there. I looked around a little more and found a very poorly preserved cephalopod impression as well as one other rock with some intriguing shapes in it- it will need more prep though to say if it is anything. Since these were dumped next to a parking lot and there are no Silurian dolomite quarries within 60 miles, I can't say for sure what the source is. It seems likely to be the Racine or Joliet Dolomite of northeastern Illinois, though. I will definitely be returning when I have some free time and looking around some more- who knows, they may have used the same stone in other spots around the development!
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Found outside of Vulcan quarry in Kankakee Illinois. Is this a CHERIRURUS NIAGARANSIS? Or a mother type trilobite from Silurian period my area is Silurian for a fact that I know.
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This partial cephalon was found in rip rap near a quarry that exposes the Silurian Racine Dolomite in Kankakee County, Illinois. I have seen similar examples listed on the auction site, but without IDs. Looking at older publications leads me to think it is Dalmanites, but I'm not positive, and definitely unsure what the species designation would be. Thanks for any help!
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Hi there, I'm Sarah, 32 years old, and live in Australia. I have a keen interest in all fossils, but particularly those of the Silurian Era. I am also very interested in shark teeth and trilobites. I joined the forum in the hope of expanding my knowledge; and obtaining occasional help with fossil identification.
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I have two items on which I am requesting opinions. These are from a dolomitic nodule from the Schoolcraft Fm. in the upper peninsula of Michigan. The first one I think is a pygidium of the trilobite Scutellum. (note there appear to be some other trilo"bits" surrounding it). @piranha, what do you think? Here is an image from Ehlers (1973) Stratigraphy of the Niagaran Series of the Northern Peninsula of Michigan that he has as Scutellum laphami.
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- graptolite
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Just found today in my back yard. First daylight in 430 million years. It was found about two metres down. We are working on a house project. I just washed it off in the kitchen sink. My question is what would you do next? I have been thinking about prep work in general, I like it, should I just enjoy it as it is?
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Help Identifying Geologic Layer/Stone and Fossils Available
RedShift posted a topic in General Fossil Discussion
Hi All, I'm new here and honestly have only a small working knowledge of Geology and fossils but I'm interested in learning. I live in and interesting area I think, Western New York. Lockport, NY to be specific and along the upper portion of the Niagara Escarpment, I have to be at least 3/4 of the way up the rise of the escarpment, I can see to Lake Ontario from my property. In this area around me, stone wall used to be a big thing and they run through the woods for miles sometimes, build back in the 1800s after the Erie Canal and marked property lines and I assume was also a good way of clearing the rock from the fields. These rocks around me that are a softer more layered rock are just loaded with fossils but mostly small shells and what looks like some small crinoid type pieces. I have been studying up and trying to research what rock I predominantly here and I think I've narrowed it down. I would just like some input on what you believe this predominant rock type is, what these shells would be, age, and what else you think could be found in these rocks if I spent significantly more time breaking open lol. I will attach an imagine of approx. where these rocks are (blue dot circled in red) and the corresponding layer that this would be. If I've narrowed this down accurately, this would be the Lower Silurian (Sik) and possibly be "Irondiquoit Limestone, Rockway Dolostone, Hickory Corners Limestone, Neahga Shale, Kodak Sandstone" I will then try to add some pictures of this stone/rock type and the shells i found and cleaned some in vinegar. really appreciate your input and knowledge on what rock this really is, what the fossils are and age range so I can research what else might be able to be found in these rocks.
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Hi all,I'd appreciate your help with this Silurian Lake Michigan fossil from the Racine formation. I've done some research and found a family of Silurian colonial horn corals that have members which do look very much like my find. It's the Arachnophyllidae family. I'm not sure if they occur in the Racine formation though. Are these badly preserved stromatoporoid mamelons next to the horn coral? The rugose coral is growing on a stromatoporoid reef? Calyce detail: Here is a North American Silurian colonial coral that looks similar. It's Arachnophyllum kayi. Found it in a USGS report about silurian horn corals. So now, to the "bumps". Mamelons of stromatoporoids? Thanks so much to everyone for your thoughts and input.
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Looking into going up to the Shawangunk formation near the Delaware River gap, looking for any fossils but would most like to find a eurypterid. My problem is I can’t find exactly where the fossiliferous parts are. I know it’s a long shot but has anyone hunted this formation before.
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I would love your opinions on these Lake Michigan, IL beach finds. Am I correct in thinking that these are crinoid calyces? As always, thanks so much for your input. A Hash rock with a terribly worn crinoid but with the outline of its calyx visible? The cup shaped (bottom part only?) of a crinoid calyx? Upside down view. Ca. 1cm wide View of the bottom Top view: Plate from the IL Geological Survey: Or something like this silurian crinoid "Sagneocrinites Expansus":
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- crinoid calyx
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Help request! I am putting together a tool for judging rock age based on very crude, whole-rock, hand-sample observations of fossil faunas/floras -- the types of observations a child or beginner could successfully make. I view this as a complement to the very fine, species-level identifications commonly employed as index fossils for individual stages, biozones, etc. Attached is what I've got so far, but I can clearly use help with corals, mollusks, plants, vertebrates, ichnofossils, and the post-Paleozoic In the attached file, vibrant orange indicates times in earth history to commonly observe the item of interest; paler orange indicates times in earth history to less commonly observe the item of interest. White indicates very little to no practical probability of observing the item of interest. Please keep in mind that the listed indicators are things like “conspicuous horn corals,” purposefully declining to address rare encounters with groups of low preservation potential, low recognizability, etc. Got additions/amendments, especially for the groups mentioned above? Toss them in the comments below! Thank you..... https://docs.google.com/spreadsheets/d/1tVm_u6v573V4NACrdebb_1OsBEAz60dS1m4pCTckgyA- 5 replies
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- algae
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Stromatolite? Found in Silurian reef. Thanks for any help..
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This was found in a Silurian reef, IL. Any idea if this is a stromatoporoid or coral?
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Was out to Birmingham to drop off friend at the airport. Flights were cancelled so decided to go fossil hunting at wrens nest in dudley.
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Hello everyone. As usual, I need your help with one of my finds. It seems this small rugose coral has a buddy. At first I thought the the tiny "bump" was just a bit of debris sitting on top of the coral. But now that it's enlarged, it looks to me somewhat similar to a crinoid. I'm not really sure though, I've never seen a crinoid preserved anything like this. Surely it's not part of the horn coral itself, or is it? Thanks to all for your input. Detail:
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I have two Dalmanitid species from the Waldron shale. I know the three on right side are Glyptambon verrucosus. What species is on the left?
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Yesterday I decided to make a quick trip before the Illinois stay at home order took place. For the past 4 years I've been trying to find all 16 of the trilobite taxa in the Sugar Run formation. So far I've found 12. The lichids are eluding me, except for a partial Trochurus welleri found last year. Here is what I think is a lichid fragment (?) Dalmanities illinoisensis pygidium continued...
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last summer I went to Gotland, Sweden, which is famous for Silurian sea life: there are some cliff by the west side of Gotland, and i found a lot of coral fossil there first one i found seems to be Planalveolites fougti and then stromatoporoids then Heliolites also Favosites also some Tetracoralla: and pieces of Crinoidea: and some other stuff: When I look at these fossil, I actually felt went back to Silurian, quite amazing (the picture has watermark because i posted it on another forum first)
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Steadly approaching 3 years of collecting from dumped dolomite piles in Milwaukee County has lead to a plethora of "Calymene celebra" molts from Silurian Dolomite of the Racine Formation. Wenlockian. Many hours have been spent with a large sledge hammer breaking out mold of Calymene and other trilobites in similar ways to the Cedarville dolomite in Ohio. The trilobites are almost always complete and are in a noted molting position shown in Weller 1907 An example from my collection and prepped Over the three years we have collected over a hundred complete individuals from the dolomite. About 10 percent of the time we find a Calymene missing its cheeks and in a more flattened preservation. The next most common type of trilobite found is Cheirurus sp. Only 3 complete internal molds have been found of this individual but partials are more common. Likely the species represented here is Cheirurus hydei Found by user evern. As noted this association of trilobites seems to best line up with Hartung Quarry in Milwaukee based on Mikulics Theisis from 1979 on Southeastern Wisconsin Silurian Trilobites. One weird thing is Bumastus being absent from our location, although the chart basically implies only one individual was found. The next trilobites on the list are sparse at best with only a few individuals seen. They are Sphaerexochus, Encrinurus, Dalmanities, Deiphon, Ceratocephala, Acidaspis and Eophacops. The last 4 represented by only 1 specimen each. After finally reading through almost all of Mikulic's dissertation, I am glad to have learned of the location of the stone I have been finding so many trilobites in over the year. Sphaerexochus cephalon Encrinurus Dalmanities Deiphon Eophacops (not mine, Field Museums) Thanks for the read. Hope evern will post his beautiful Dalmanities Cephlon when it is finished prep.
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