Search the Community
Showing results for tags 'silurian'.
-
Is this a gastropod? The sample is 1.5 cm long.
-
My daughter found this on our trip last Monday. She has an eye for trilobites and we thought that's what it was. After looking at it closer today, I'm wondering if it is actually crinoid? It's the only one we found like it... Any and all feedback appreciated! Thanks in advance.
-
Hey guys!!! We took a trip to the Buffalo area for a night and drove to a Silurian age spot that I've never been to before, prior to heading back... So I know I have a trilo-butt near the circled area, but I'm wondering the the circled fossil is trilo as well? Figuring shell but wanted to check. I know the second picture isn't that clear but the larger black area I thought someone may recognize as something? Probably a long shot... lol It just looks a bit different from what I have seen so far. Thanks in advance!
-
I presumed this to be just coral until I saw some pics of bryozoans that looked liked faces. Is this coral?
-
Found this piece of float in a place where there is a mix of native scree and fill from God knows where. Due to circumstances I was not able to climb the slope to try to find a source layer. Exposed bedrock I think is Mifflintown Formation. The slab of hash shows three reasonably clear specimens without any prep. Each has a ring with triangle segments pointing toward the center, and one pair of dominant rays running from the center to the perimeter. Someone on the FB group pabe suggested "Cyclosystoid" which I had never heard of, and there is only a little available on google that isn't paywalled. Eventually I'll focus on the other species in the hash to try to verify its Mifflintown and not trucked in fill from who knows where. What do you thiink? (PS thanks for the lead so far, Greg)
-
References: Hughes NC, Hong PS, Hou JB and 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. Front. Ecol. Evol. 5:37. DOI: 10.3389/fevo.2017.00037 PAUL S. HONG, NIGEL C. HUGHES, AND H. DAVID SHEETS (2014) SIZE, SHAPE, AND SYSTEMATICS OF THE SILURIAN TRILOBITE AULACOPLEURA KONINCKII. Journal of Paleontology, 88(6), 2014, p. 1120–1138. DOI: 10.1666/13-142
-
- 1
-
-
- aulacopleura
- liten fm
- (and 3 more)
-
I was wondering if this is a brachiopod interior, and if so, could it be rafinesquina?
-
This post is about a fossil look alike, or to quote my kid, "a foss ilarm". Earlier this year I was scratching my head about stromatolites, stromatoporoids, and algae and coral in general. It started with finding what I dubbed "the sandwhich rock" (first 3 pics) at a roadcut in Blair County, central Pennsylvania (US). The outcrop is Mifflintown-Bloomsburg (undivided). My best guess is this form the Mifflintown part. Friends that know their stuff told me about "honeycomb weathering". Besides the Wikipedia article, there is more than I ever wanted to know in the Treatise on Geomorphology Volume 4, Weathering and Soils. I returned to the site and took more photos. This outcrop is on a very busy city highway and just below a freeway overpass. I wanted to know if the weathering is just from modern-day exposure, so I poked at the rock layer until I found a piece that was still in place, but loose. To my surprise, it was olive brown and pitted like this all the way around, even the back side which had not been exposed to wind/sun. I removed that piece and cracked it open.... and was even more surprised to find the inside of the rock is light grey with brachiopods and broken trilobite bits. it failed the vinegar test (no fizz). The inside of the rock looked untouched, to my noobie eye. And that makes me think that all this pitting is from very recent time. In my superficial reading, I've seen frequent references to salt as a common factor in weathering. Even though the backside of the rock was still really pitted (R side of pic with my fingers), there is probably a lot of highway salt that makes it way into the soils and float on the face of the outcrop. Is it a player? Beats me, I've gone as far as I can thinking about this. Except to note my extreme-environment microbiologist wife always likes to say "microbes rule all!!"
-
I visited a small Paleozoic (Silurian) coral reef in Indiana the other day. No earth-shattering, jaw-dropping discoveries, but it's an interesting spot with dolomitized fossils. Here's a google earth view of the center of the reef. A nice mollusk, if anyone knows what species, let me know. It shattered when I tried to extract it, but I was able to glue it back together as you can see here. Sphaerexochus romingeri cephalon After extraction.. I believe this is a Platyceras: To be continued..
-
I don't know if this is mineral or fossil.
-
Are these two samples corals? The first is 0.5 cm; the second is part of a 2 cm "stalk."
-
I opened a rock today and found a sample that I believe to be the same as another which I haven't been able to identify. I would love to know what it is I am looking at. Thx!
-
I am not always able to understand when I am looking at a sponge. Thx in advance.
-
I have a lot of coral but none like this one. I don't know whether it's size is the result of the fossil process or coral type. It's 3.5 cm tall; circumference is 12.5 cm.
-
Is this an echinoderm?
-
I was wondering if this might be a plant fossil, or is it an imposter? Found in Kosciusko County, Indiana. Silurian? Devonian?
-
I am wondering if this sample is a trilobite. The second pic contains an additional sample. Both taken from the same rock.
-
I was wondering about this pattern. Thx.
-
This is a macro shot of a samples measuring btn 1/8"-1/4". I was wondering if it's coral.
-
I pulled this from the creek and wanted to know if it has enough information to posit an ID.
-
I am looking for help in making accurate IDs of some fossils from northcentral Indiana, wondering if they are bryozoans. All are approx 1/4"-1/2".
-
Hi all, first post here. Central PA, Slab from roadside float from Mifflintown-Bloomsburg (undivided). A thin layer contains a lot of small (1/16" dia), flattish fossils that I think might be inarticulate brachiopods. I have a number of specimens from other parts of the exposed layers and these do not appear in any of the others. One old paper on this formation mentioned "inarticulate brachiopods". I'm new enough that I didn't know about the articulate and inarticulate division in this group, so I'm already learning stuff. Awesome. Googling some pics returned some images that kinda look like what I have. But not quite. What do you think? If not inarticulate braichiopod, what else could they be?
-
Central PA, Mifflintown-Bloomsburg (undividied) Block collected from roadsite float. Its pretty variable, with a flaky/fissile layers alternating with slightly more cohesive ones. Lots of broken brachiopod bits. For an experiment to I dropped an unremarkable flake the size of a large coin in some vinegar and let it soak for a day. The flake had a couple brachiopod bits and I wanted to see if they would fall free or dissolve in place. The brachiopds disappeared and I was left with this (see pics). Of course I got really excited and thought I had an early fish spine, but now I think I dissolved a crinoid stem and what we see is the matrix that filled in the soft bits. What do you think? Total length is 3/4"
-
Stocker, C., Williams, M., Oji, T., Tanaka, G., Komatsu, T. and Wallis, S., 2019. Spirits of Yokokurayama: shrine of the Japanese trilobites. Geology Today, 35(1), pp.15-19. https://onlinelibrary.wiley.com/doi/full/10.1111/gto.12255 https://www.researchgate.net/publication/330640693_Spirits_of_Yokokurayama_shrine_of_the_Japanese_trilobites Yours, Paul H.
