Although it looks like it could be from the chalk (flint) of Flamborough head, I would say it has come from the beds at Speeton (Speeton Clay) The Cretaceous period.
Left behind by the glaziers when they recieded aprox 12000ygo
Definately not man made, like the things you find at Rollston.
The surface rind and texture lead me to consider it to be natural, probably flint, but not symmetrical enough for a belemnite.
The end in the photo was a natural fracture which was partly filled with a white mineral, probably calcite, which you see now as a partial veneer.
Tabfish. I don't know what's happened to your images, i saw them and now they have gone from my screen. Anyway i think i had something similar a few years ago but now it seems to have gone...kids i think.
If you see a rock on the Holderness covered in BIG barnicals like in the image below, you know the sea bed out to sea has been turned over and thrown up on the beach because of the energy in the swash zone on the shore, (probably after a storm)
Hope this helps in your fossil collecting.
Tabfish, i've never noticed loose rocks with barnacles on them here at Hornsea, even after a severe storm, but thanks anyway. I wish we would have some northerly winds instead of all these south-westerlies, there's about 60 cm of sand up at the cliff base that's been there since septemberish. Here's some a bit out of focus shots of the beach just over half way between Hornsea and Mappleton, taken 8-12-13 just after that rough weather. The rock? is fresh out the cliff, well it was'nt there the last time i was down a month before and roughly measures 60 cm x 120 cm.
A very nice find Ash
I think it is an ammonite from the Upper Jurassic called Hecticoceras sp, but it would be good to see an image of the 'keel' outside of the ammonite.
It's a 'hands and knees' job when you find a patch of pyrite/black sand because some of these ammonites are very small but well worth collecting and they have the added bonus of usually not rotting away.
I hope you don't mind but I have added some images of similar ammonites that we have collected.
Great image showing the suture lines of the ammonite.
Hi Tabfish, and thanks for your thoughts on the id. I will try and do a Keel shot at the weekend because i would love to know more about this one...my favourite at the moment. One of the main reasons i love these is that they look great for my photography...well only this one at the moment, the others need prepping. You have a nice varied collection there, and i see one that looks similar to mine. Thnks again.
As I have said you have shown us some great images and it is obvious you are into photography with the quality of your images, I usually carry a geo hammer, a ruck sack and a camera for the special things you find on the Holderness that I cannot take home.
Lets see some more of your finds!