Registered: 1516311748 Posts: 2
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OK, so I pace fields near to Axmouth and Lyme Regis.
Am finding fossils regularly, and although I think I may know what they might be, I could do with some help regarding how old, and maybe also how a Chert Nodule is even formed.
Pictures attached. They're all peachy, in my opinion. I can enlarge any of these, if required.
Micraster Urchin(s), Echinorys Urchin, Mussel(s), Oyster, Seashell, Coral, Scallop Sp. and a fragment that looks like is should be something.
Registered: 1249264536 Posts: 2,330
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Hello and welcome to the forum.
You aren't too far off with your ID's, but I would need a lot more photos of each individual specimen, taken in natural over cast light, a scale (a mm ruler is the best) and as many different views of each as is possible and close ups (macro) of any fine detail. They are all I think of Creaceous age (65 - 120 myo) and I think between 65 and 80 myo. From what I can see at the moment: 1, 2 & top leftof 2nd photo are a bivalve of the genus Inoceramus. Top right 2nd photo I can't tell - ned more photos. Bottom pspecimen is an urchin, but can't tell any more without more photos. The ?coral as above (but not urchin). The urchin in flint - will it come out? Need more photos (macro of top centre, underside and profile).This applies to all urchins. The next photo is (top) Inoceramus, bottom left need better photos and right is another urchin. The last photo, left urchin, but need more photos and right is a parial bivalve, but need moe photos. I'm sorry for going on about photos, but it is difficult to give correct ID's from photos as it is - different fossils have various ID criterea, but what you have found are pretty good! Keep it up and we LOVE photos. Lastly, your nodules are flint rather than chert - they are both the same substance (Silicon dioxide [SiO2] but flint formed in the Late chalk (65 - 85 mya), while chert formed between 100 - 130mya (and at other times in geological history). Regards, __________________ Colin Huller
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Hey, such a detailed response, thanks.
I had these fossils as approx 60 - 90 million years old, so maybe I got this bit right. Give or take a few years, obviously.
Registered: 1516311748 Posts: 2
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Thank you for your prompt reply. Here are pics of most you ask for. Hopefully I can answer with the photos I have.
A question of my own too. Please bear with me, ok?
Top right of 2nd Photo is as best I can offer. A Gastropod of some kind? I don't own this fossil. Bottom Urchin, I don't still have either, sorry. Assumed it to be a Micraster Urchin. I find a few of these, but only post what looks good.
Coral ? Is here, with ruler. And a reverse side too. It's pretty small.
The Urchin in Flint no longer belongs to me. It was about 3cms across the widest part, and about 4cms deep. I wouldn't ask it was taken out of the stone, in case something got broke. Isn't it best left in the stone anyway ??
Better photo of the mystery fossil can only be bigger. Nothing at all to see underneath.
The last two are all I can offer also, Urchin, and Scallop type. Best pic is attached.
Registered: 1453160307 Posts: 12
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Pic w/ blue background shows an Inoceramid bivalve, Micraster and an abraded Spondylus spinosa scallop in flint...