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Around 2000-2001, I worked for a construction company on a site in Daventry, which I believe is now the Tescos distribution centre at DIRFT, nr. Crick.

The ground was often a blueish grey clay, and it had a hell of a lot of fossils in it. Rain and digging pits for foundations would wash out a lot of fossils, including Belemnites, Ammonites, bivalves, brachiopods, molluscs, crinoid stems etc.

Up the far end of the site was some red shale, and this had a lot of plant fossils, Lepidodendron mainly, and I believe I might have a Cruziana trilobite track too.

I'd often spend my lunchtime poking around, and would usually have my eyes on everything coming out of the ground.

20180917_200300.jpg  20180917_200349.jpg   
The suture line can just be made out here.

The second larger specimen-
20180917_200448.jpg  20180917_200501.jpg 

The main highlights on the grey clay-
20180917_201944.jpg  20180917_201951.jpg  20180917_201955.jpg  20180917_202002.jpg  20180917_202029.jpg ^ A carnivorous mollusc bored a hole into the larger mussel shell above.20180917_202013.jpg 

And finally into the red shale-

20180917_200725.jpg  20180917_200746.jpg  20180917_200814.jpg  ^ this is the reverse side of the shale piece on the right, both sides had scale tree fossils.

Finally the possible Cruziana-

Maybe it is part of a plant fossil, most likely just seeing the band across it is what made me pick it up, but after a section flaked off, it showed a more 3D shape into the shale.

20180917_201000.jpg  20180917_200930.jpg  20180917_200922.jpg 

Any ideas on what sort of ages these would be?
There is a slight possibility I've ended up mixing some other bits and pieces collected along the way, the the red shale, large ammonites, crinoid stems and stars and belemnites would certainly been from Daventry.

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Dirty Pete
Nice assemblage of Jurassic (Liassic) (+/-195 million years old) fossils you've got there. The plants look Carboniferous (+/- 310 million years old) and your trilobite trail is maybe a lepidodendron cone (lepidostrobus). Daventry is on the lower Jurassic so assume your Carboniferous stuff (coal tip waste) was brought in from elsewhere as building material.

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Lepidostrobus, yes, I think I'd have to agree on that, thanks.

Not having the ends showing gives the impression it might have been a long track.

There was only one small patch of the red shale, and everything else was a uniform grey mud.

During the construction, there was a very tough "Clerk of Works", a guy hired in by the final customer to go around the check everything, and he would pick up any tiny little issues.

When the foundations and bases were dug out ready for a concrete pour, he'd be there watching them, and if he saw any of the bank flake away from the soft waterlogged clay, we'd have to stop everything, dig all the concrete back out, pull out the steel reinforcing mesh and jetwash it clean again.

The floor of the main warehouse part was also made with steel fibre reinforced concrete, this was concrete with little zig zag metal wires in it, very similar to half a hairclip, and it was also doubled up with the regular steel mesh (apparently against recommendations) and it seems the metal strands bunched up and didn't flow around the mesh, leaving voids, and everyone started sueing each other.

That said, I've been looking at google maps of the area, and there does seem to be patches of land around there that might be accessible for a further hunt, but ideally it would need to be checked out in person.

The carboniferous part was the most interesting from the decent fine grained preservation, but I guess it would be highly unlikely to find any more of it if it was brought and tipped there by someone.

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Dirty Pete
Assuming you live near Daventry, your nearest Westphalian (coal measures) would be the Warwickshire coal field (b/n Coventry and Tamworth). I dare say any old tips will be grassed over and landscaped by now and hard to find. The Jurassic stuff is worth pursuing I reckon, see if you can find a piece of ichthyosaur or plesiosaur.

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Very nice specimens, particularly the bivalves (the best ones look like Pholadomya, Pleuromya and Modiolus to me). The gastropod (snail) is probably Pleurotomaria.

Re very tough "Clerk of Works" - that's what they need these days! Some of the stuff one reads about new-build houses makes one shiver ...
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