|
|
Post by ianr on Oct 3, 2019 10:24:16 GMT
It looks to me like mud that's solidified but I'm probably wrong  found it on the beach ian  by ian robinson, on Flickr |
|
|
|
Post by Harold Smith on Oct 3, 2019 10:43:58 GMT
Geology not really my subject but I think it is a conglomerate. Mud Stones are usually very fine grained.
Harold.
|
|
|
|
Post by Tringa on Oct 3, 2019 17:41:13 GMT
I'd go for a conglomerate too, but I don't even qualify as a beginner when it comes to rock types.
Dave
|
|
|
|
Post by ianr on Oct 4, 2019 9:45:12 GMT
Thanks for that both I can see that now, I tend to just look and think oh pretty ian |
|
|
|
Post by Cotham Marble on Oct 4, 2019 11:14:18 GMT
Location might help with getting to an identification. The flat,thin,square form of the stone suggests a thinly bedded strata that would be locally characteristic, at a guess I would say the 'lumps' are eroded moulds of shells rather than stoney inclusions. Conglomerates tend to have harder inclusions cemented by a softer fine material, the cement typically erodes quicker than the inclusion leaving raised more resistant bumps of different colourations rather than a universally smoothed surface of the same colour. Examples here, although shell fragments are still evident: www.southampton.ac.uk/~imw/jpg-Portland/9PTF-Lima-Bed.jpg and www.southampton.ac.uk/~imw/jpg/ostrigo.jpg |
|
|
|
Post by ianr on Oct 5, 2019 8:55:29 GMT
Thanks CM location was east coast Huttoft car terrace near Mablethorpe Lincolnshire one of the few places I know were you can drive right up to the beach  good when the weather is a little wild I did find another rock dark grey with the odd fossil shell fragment, you don't see a lot of rock on the beaches around here bit of flint odd rock, piece of chalk here and there. Not even many pebbles this part of the Lincolnshire coast has great fine sand and lots of it ian |
|
|
|
Post by Cotham Marble on Oct 5, 2019 11:05:05 GMT
Strictly an amateur with geology, and it's not an area of the country I'm familiar with, my guess is though anyone with a knowledge of Lincolnshire geology could put a name to what you have. A look at the geology viewer mapapps.bgs.ac.uk/geologyofbritain/home.html shows the underlying rock is chalk which makes it pretty safe to suggest that your stone is building material brought from elsewhere. There are a number of formations in Lincolnshire that could yield a rock with those characteristics and I wouldn't be confident about saying which, though there a several ironstones e.g Claxby which might fit the bill. As far as what you have then either fossil moulds, coral fragments, the fills of mollusc burrows, a mud surface stabilised by bacterial mats or some combination of some or all of these. Or something else |
|
found it on the beach
good when the weather is a little wild