Whitby area finds

[dhiggi]

Went to a beach in the Whitby area today, it was very slim pickings until my daughter saw the first of these items shining amongst the rocks. I’m guessing some kind of pyrite bivalves?

The second item is something I saw on our way off the beach, am I right in thinking they’re crinoid stem sections?

 

Thanks in advance 

 

[Pterygotus]

Yes you are correct on both ID’s .

[LiamL]

Nice finds

[Tidgy's Dad]

At lease some of those bivalves look like Pseudomytiloides dubius to me. 

[TqB]

I agree with @Tidgy's Dad about the bivalves.

The crinoids are Carboniferous - a glacial erratic block.

[Tidgy's Dad]

1 hour ago, TqB said:

I agree with @Tidgy's Dad about the bivalves.

The crinoids are Carboniferous - a glacial erratic block.

And I agree with Lower Carboniferous crinoid columnals from an erratic. 

[dhiggi]

Thanks everyone. 
@TqB I was unsure about the crinoids as I hadn’t seen any in the area before. It was in a relatively high traffic area of the beach in rock that could quite conceivably have been brought from elsewhere though. Are they found anywhere in the local area?

[Tidgy's Dad]

I believe Pentacrinites sp. is found in the Lower Jurassic of the Whitby area. 

[TqB]

1 hour ago, dhiggi said:

Thanks everyone. 
@TqB I was unsure about the crinoids as I hadn’t seen any in the area before. It was in a relatively high traffic area of the beach in rock that could quite conceivably have been brought from elsewhere though. Are they found anywhere in the local area?

It'll be a glacial erratic - there's a lot of glacially transported Carboniferous material on the Yorkshire coast. Corals and crinoidal limestone are the most obvious. The nearest origin outcrops now are the Pennines (Yorkshire, Durham) and Northumberland (plenty of coastal locations) but it could be from as far away as Scotland. 

 

1 hour ago, Tidgy's Dad said:

I believe Pentacrinites sp. is found in the Lower Jurassic of the Whitby area. 

P. dichotomous is a nice scarce find in the Upper Lias there. Seirocrinus is another rare one from the Grey Shales (basal Upper Lias).

Middle and Lower Lias crinoids of various genera (Isocrinus, Balanocrinus, Hispidocrinus but not Pentacrinites)  are locally common up and down the coast.

 

They mostly have obviously star shaped stem ossicles  while virtually all the Carboniferous ones are circular. That's not infallible but a good starting point for ID.

[grandpa]

Congratulations on a great outing with your daughter.  Give her a big hug and tell her she did very well.  Encourage that interest and continue to train those eyes of hers.  She's a treasure.