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  4. Geology, Palaeontology & Archaeology
  5. What is this lumpy rock found at Lyme Regis?
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What is this lumpy rock found at Lyme Regis?

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Offline chris (OP)

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What is this lumpy rock found at Lyme Regis?
« on: 12/08/2021 00:11:37 »
Can anyone offer me a diagnosis on this specimen I picked up yesterday on the beach at Lyme Regis.


* ROCK.jpg (1257.23 kB . 2851x3001 - viewed 4506 times)

It's heavy; the lumpy bits are smooth ovoid balls about 10mm across and the material surrounding them looks "spongy". In some places there are cup-shaped recesses left where the balls appear to have dropped out.

To my untrained eye, it looks like a fossilised fish egg case.

Can anyone help?
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Offline chris (OP)

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Re: What is this lumpy rock found at Lyme Regis?
« Reply #1 on: 13/08/2021 08:32:31 »
Intriguing. No one seems to know what this is! It's a mystery... Twitter was relatively subdued on the subject, and normally that lot get to the answer in a jiffy...
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Offline Colin2B

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Re: What is this lumpy rock found at Lyme Regis?
« Reply #2 on: 13/08/2021 08:39:18 »
It certainly looks like an egg cluster.  I’ve been looking online and found much larger clusters.
Yours looks like whelk egg cluster, but if one fell out then they were loosely bound eg by mud.
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Re: What is this lumpy rock found at Lyme Regis?
« Reply #3 on: 13/08/2021 09:01:58 »
fossil fish eggs 2nd column 3rd down + others https://www.google.co.uk/search?q=fossil+fish+eggs&client=safari&hl=en-gb&prmd=isvn&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiQ1vC4w63yAhWFiVwKHRrjBXE4ChD8BQgUKAE&biw=1024&bih=666
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Re: What is this lumpy rock found at Lyme Regis?
« Reply #4 on: 13/08/2021 22:43:58 »
Quote from: chris on 13/08/2021 08:32:31
Intriguing. No one seems to know what this is! It's a mystery... Twitter was relatively subdued on the subject, and normally that lot get to the answer in a jiffy...
I see. That's where you get your answers these days is it Chris?
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Re: What is this lumpy rock found at Lyme Regis?
« Reply #5 on: 15/08/2021 21:48:09 »
Quote from: Petrochemicals on 13/08/2021 22:43:58
Quote from: chris on 13/08/2021 08:32:31
Intriguing. No one seems to know what this is! It's a mystery... Twitter was relatively subdued on the subject, and normally that lot get to the answer in a jiffy...
I see. That's where you get your answers these days is it Chris?

We have 50k followers on Twitter. Among them are some highly qualified specialists who know other highly qualified specialists. Twitter is an ideal venue to seek counsel on certain subjects.
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Offline Petrochemicals

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Re: What is this lumpy rock found at Lyme Regis?
« Reply #6 on: 16/08/2021 04:55:05 »
Quote from: chris on 15/08/2021 21:48:09
Quote from: Petrochemicals on 13/08/2021 22:43:58
Quote from: chris on 13/08/2021 08:32:31
Intriguing. No one seems to know what this is! It's a mystery... Twitter was relatively subdued on the subject, and normally that lot get to the answer in a jiffy...
I see. That's where you get your answers these days is it Chris?

We have 50k followers on Twitter. Among them are some highly qualified specialists who know other highly qualified specialists. Twitter is an ideal venue to seek counsel on certain subjects.
Very impressive.
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Offline jbingham

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Re: What is this lumpy rock found at Lyme Regis?
« Reply #7 on: 19/08/2021 06:34:53 »
Keying off of it being heavy, here are some possibilities (search the term on Google Images for pics):

Limonite (Goethite)

Hematite with botryoidal forms

Botryoidal Calcite with Pyrite

Manganese nodule

Iron-Oxide Concretions and Nodules

I'm unable to post links, but you should check out a post on Reddit (r/geology) titled:  " Iron ore? Goethite? Limonite? More pics in comments "  In the comments, a streak test is discussed. Of course, you may want to consider posting there, too. 

Hope this helps.

Jason
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Re: What is this lumpy rock found at Lyme Regis?
« Reply #8 on: 15/09/2021 01:58:06 »
coprolite??
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Re: What is this lumpy rock found at Lyme Regis?
« Reply #9 on: 09/11/2021 19:29:41 »
Quote from: Petrochemicals on 16/08/2021 04:55:05
Quote from: chris on 15/08/2021 21:48:09
Quote from: Petrochemicals on 13/08/2021 22:43:58
Quote from: chris on 13/08/2021 08:32:31
Intriguing. No one seems to know what this is! It's a mystery... Twitter was relatively subdued on the subject, and normally that lot get to the answer in a jiffy...
I see. That's where you get your answers these days is it Chris?

We have 50k followers on Twitter. Among them are some highly qualified specialists who know other highly qualified specialists. Twitter is an ideal venue to seek counsel on certain subjects.
Very impressive.

I Wonder how You cope up with Spam & Trolling in consideration to 50K!

That Surely must be Even Alot More Impressive!
👏
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Offline Bogie_smiles

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Re: What is this lumpy rock found at Lyme Regis?
« Reply #10 on: 21/11/2021 22:25:58 »
It looks like it could be fossilized corral, weathered, :shrug:

fossilized coral


1403,
« Last Edit: 22/11/2021 00:00:28 by Bogie_smiles »
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