Naked Science Forum

Non Life Sciences => Geology, Palaeontology & Archaeology => Topic started by: Nhrockhounds on 19/10/2017 01:26:43

Title: Identify these 2 rocks?
Post by: Nhrockhounds on 19/10/2017 01:26:43

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Can I get some assistance identifying these 2 rocks?

I think they are the same mineral, but have no clue what rock/mineral they are...

What is the name of this rock/mineral please?

Title: Re: Identify these 2 rocks?
Post by: chris on 19/10/2017 07:45:51

Please tell us where you found them, in what context and any other information that make help us to make a diagnosis.

Title: Re: Identify these 2 rocks?
Post by: Nhrockhounds on 19/10/2017 09:14:46

Quote from: chris on 19/10/2017 07:45:51

Please tell us where you found them, in what context and any other information that make help us to make a diagnosis.

Thanks!
They were found in Plymouth, NH in the forest in a brook that runs through glacial gravel deposits from the last ice age.

Title: Re: Identify these 2 rocks?
Post by: RD on 20/10/2017 17:11:44

Possibly crinoid fossils (https://en.wikipedia.org/wiki/Ossicle_(echinoderm)#/media/File:Crinoid_Fossils_of_Jurassic.jpg) ?

(https://www.thenakedscientists.com/forum/index.php?action=dlattach;topic=71645.0;attach=24156;image)

Quote from: .wikipedia.org

Silurian New Hampshire was home to creatures like brachiopods, bryozoans, corals, crinoids (https://en.wikipedia.org/wiki/Crinoid), and trilobites ...

https://en.wikipedia.org/wiki/Paleontology_in_New_Hampshire#Prehistory

Title: Re: Identify these 2 rocks?
Post by: chris on 20/10/2017 23:15:22

What a fabulous photograph, @RD

Title: Re: Identify these 2 rocks?
Post by: Bill S on 21/10/2017 15:52:53

Quote

What a fabulous photograph,

What a fabulous specimen!   Must be an emoticon for envy, somewhere,

Title: Re: Identify these 2 rocks?
Post by: RD on 21/10/2017 17:13:21

Just to make it clear: I haven't enhanced the OP's photo to bring out detail,
I've just superimposed a crinoid-fossil image (https://commons.wikimedia.org/wiki/File:Crinoid_Fossils_of_Jurassic.jpg) on top of part of it, for comparison ...

(https://www.thenakedscientists.com/forum/index.php?action=dlattach;topic=71645.0;attach=24157;image)