Please could we have some more photos - other sides/angles. With scale (I appreciate your hessian sacking gives a clue.)
As it is, I can't tell if the shapes we see on the (curved) surface as connected or separate, nor whether they are manifestations of a wavy surface or cylinders.
Also, under a hand lens, can you see structure in those lines? (ignoring the fracture surface itself).
I'm interested to know if you see lines running across or along (or maybe some of each orientation).
Only took one image of it! Mike, i will take some more tomorow.
The 'fossils' stand proud of the rock they are in so they are harder and probably will prep out of the surrounding matrix that is about 3in in length.
Found another interesting rock with a recess in it's side the same day, don't think it is were something has been but it is still interesting because of the cavities shape.
Re the preceding post/image (not the original specimen in this discussion):
I think I can see fine ridges running across the back of that recess...
If true, that suggests it is a mould of a fragment of a large bivalve (large enough not only for the evident thickness, but also the almost lack of curvture). The fine ridges represent calcite fibres, and seen in a section like this are commonly referred to as a palisade. Here's a clear example:
I found this Gastropod at Mappleton, can you help with the I.D, it is Lower Jurassic, Middle lias.
Could do with prepping.
Still not back on 'shift's' but not far off.
I fully understand about not having time as we have a very active and creative 4 and a half year old grandson over for the weekend.
He is very artistic and questions all things interesting including the fossils, he knows the difference between a 'Dac' and an 'Arni' but I cannot get into him you call Gryphaea 'Devil's Toenails' he calls them Devil's no tails!
No rush to id the gastropod as I will prep it one day for our collection, in the same block is a Pleuroceras sp, I have attached an image of the ammonite for you to have a look at.