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Showing results for tags 'galena group'.
Found 4 results
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A nice Dictyonema flabelliforme dendroid graptolite from Oslo Fields in Norway. It's Tremadoc, Lower Ordovician in age and is thus maybe around 480 mya. Another angle :
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- amplexopora
- amplexopora septosa
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I have a partial cephalon of a trilobite from the Galena Group (Late/Upper Ordovician) from NE Iowa that I obtained from Mike @minnbuckeye, and am having trouble ID'ing. Given the partial nature and somewhat poor preservation, an ID may not be possible, but the glabella seems distinctive enough that someone may recognize it even though I believe the eyes are missing. I've removed some matrix from it, but thought I was about to do more damage than good if I went any further. In reading through a variety of papers, the best match I can find is a Greenops species (maybe G. fitzpatracki or something similar) but these are Devonian in age so that's not it. What are the Ordovician genera that have that type of face found in this area? Big rounded glabella with distinctive furrows and pustules all over it. Here are some pictures and I'm hoping some of our trilobite experts may recognize this one. I saw some Ordovician genera such as Pterygomeetopus and Ceraurus that are close but still don't seem to match best I can tell. Any ideas will certainly be appreciated or hints to further papers I can search through. Here is an overall image of the cephalon from the top. The black bar is 1 cm. Here is a bit closer image to show the granulal nature of the glabella. The overall width is estimated at 1.5 cm and the length is right at 1 cm. A profile view of the subject. A full frontal again to demonstrate the overall shape. Thanks for any and all ideas!! Any ideas
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Hi all. I posted about a week ago in this forum with what I thought was a Maclurites fossil I found in the Galena Group in Illinois: http://www.thefossilforum.com/index.php?/topic/116602-ordovician-maclurites/. Others agreed with me. There are two parts of this fossil that I wonder about. One is fairly large and may be a piece where the outer shell of the Maclurites broke to reveal an inner layer. It may also be a second specimen that was fossilized along with the Maclurites, replacing part of it. (I bet there's a term for that, but I don't know it!) This part of the specimen stands out by virtue of being browner than the rest of the specimen. The second part presents a similar question. There is either an inclusion of a small gastropod near what I think is called the aperture of the Maclurites, or the Maclurites is fractal in form. Can somebody weigh in on what these two parts might be? I took pictures of the large part (broken outer shell vs. second fossil inclusion) from a number of different angles and distances and with some different lighting to try to help with identification. The final picture is the second, tiny gastropod vs. small, fractal portion, although you can see this in some of the other images also. (My money is on a second, tiny gastropod, although fractal structure would be way cooler!) First angle A closer view at this same angle Closer view from the same angle but with different lighting A view from a second perspective And closer up with this second perspective A third perspective Closer from third perspective And a bit closer from third perspective and with different lighting A fourth perspective Closer view from fourth perspective A fifth and final perspective And closer from fifth perspective And even closer from fifth perspective Finally, the small gastropod or fractal portion Thanks for your help!
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This morning I met about 12 other members of E.S.C.O.N.I. (Earth Science Club of Northern Illinois) at Irene Quarry in Belividere, Illinois for a quick 3 hour visit. The quarry contains hard rock Ordovician dolomite from the Galena Group. This was my first time at this quarry and though I did not find much, I had a great time with the group and we could not have had better weather. Here are some views of the quarry: Here are a fews pics of my finds: Receptaculites- Receptaculites and Hormotoma- Horn Coral- I believe Strepteasma Brachiopod- At first thought that this was a trilobite Cephalon, but now think it is a brachiopod, looks similar to the brachiopod above. If any one can ID, please do so. One of the collectors found a large cephalopod in a block of dolomite. Here is the large section out of the block- Receptaculites - of course I did not take this one.
