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Pjoe

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Reply with quote  #1 
Hello, we found these at lyme regis and at codgen beach in 2017. Can someone please tell if these are fossils? Thank you.

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Barrow Museum

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Reply with quote  #2 
First photo is a pebble of Upper Greensand (top of the Lower Cretaceous, Albian Stage) containing the serpulid worm tube Rotularia concava; identifiable from its characteristic tendency to grow in a spiral shape, unlike most serpulids.  The green colour of the rock is attributable to the mineral glauconite, which only forms in a shallow marine setting, so you can get an idea of the environment in which this rock was deposited. The Upper Greensand unconformably overlies the more famous Lower Jurassic of Lyme Regis, forming the paler layer on top that gives the nearby Golden Cap its name.

The middle photo is not fossil - it's a nodule of hardened mudstone which has the beginnings of a shrinkage crack containing (probably) calcite inside. 

The last image is more difficult from just a picture.  It seems to contain some shell fragments, but is it possible that it is just a slab of cement made with beach-derived aggregate?  A drop of Phenolphthalein would confirm cement, if it turns purple.
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prep01

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Reply with quote  #3 
Hello and welcome to the forum. The 1st photo looks more ' limestone' than Greensand to me, but they are sections through fossils and some may well be Serpulids, but I see other shell sections and an ammonite setion as well. Photo 2 I believe is a flint (again from the upper Greensand) with Chalcedony crystals in their 'botroidal' form. The 3rd photo looks liike limestone wth lots of bits / cross sections of shells and a Promicroceras ammonite which I have annotated in the photo below.
prom.jpg 


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Colin Huller
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TqB

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Reply with quote  #4 
I agree with Rotularia in Upper Greensand for the first one, common in the area.
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Tarquin
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Pjoe

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Reply with quote  #5 
Thank you so much everyone. :)
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