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Showing results for tags 'lower ordovician'.
Found 11 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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- dictyonema
- oslo
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Ordovician northeast Arkansas.Found in the same general location.Some show groth lines and a deep cone shaped hole in one end.I am thinking cephalopods or siphuncles?
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I am guessing Coral Sponge or Bryozoan I do not know.So I need an ID.Found in creek gravel,Northeast Arkansas,Lower Ordovician.Thanks.
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I found these fossils in creek gravel Northeast Arkansas Lower Ordovician.Someone please tell me if they are a sponge or coral.And the name of species .
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Hey folks, I was wondering how you guys would approach something like this (or if samples like this are even worth your time!) There's so much going on I'm a little confused as to how and where to start. would you remove the gastropods individually, break the rock apart, sacrifice the broken ones in the search for more complete specimens, leave it as is? I went through the pinned messages and learned a lot, but was curious if anyone's come across similar types of rock and could give some insight. My goal is to hopefully find and extract some of the more com
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- lower ordovician
- gastropod
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This stone came out of a stream-bed, so no certain provenance; BUT - I'm sitting on the top of the Oneota dolomite, in extreme SE Fillmore County, SE Minnesota. Ever since I moved here, I've found blocky chunks of what I always called quartzite in nearby stream beds; often with ripple marks like this: Sorry about lack of scale, but if you look at the top of the stone, you can see a northern pin oak leaf - it's about 4 inches long. I was told when I arrived that my Oneota dolomite was overlain by the St. Peter sandstone- which has no record of rippled silicified layers. Two years ago, a
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This rather tasty, large graptolite just arrived after a surprise auction win. It's labelled Clonograptus rigidus Hall which seems reasonable though I'm always being caught out by these. The location is given as 25km north of Zagora (should be OK?) but the age is given as Floian stage when I'm pretty sure it should be Tremadocian, probably Murrayi Zone. ( @Spongy Joe - I guess you've seen a lot like this... )
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The reverse of this piece has specimens of Tetragraptus serra. and this side shows fragments of other graptolites, possibly Tetragraptus and / or other Dichograptids.
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This is another piece of algal biostrome filled with fossils from the Prairie du Chein at Stillwater, Minnesota. This shell is much better preserved than most pelecypods in this formation because it is on the sole of the bed within the aperture of a large coiled mollusk. (I can't tell Bucania from Protowarthia but both are possibilities) Bivalves are usually found as separated adjacent halves, completely covered in vuggy crystals. This valve is only slightly overgrown by the algae so I can still see shell material. There are also a tentaculites and two different large orthid brachio
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I found a prickly ball with an asymmetrical star and a raised rim on the top, a flattened bottom, and what looks like a short stalk. It measures 68 mm across including the stalk, 48 mm tall, and it is missing parts of its edge and side. Inside it is a pale beige chert. The exterior is very finely ornamented and covered with tiny angular holes that are making my camera pixelate. I have done my best to capture the fine detail, There are also some tiny pyrite ooids in the deeper areas on the face and on the bottom. The stalk feature is encrusted in bright white lime, and has resiste
