GuidesMagazineShopBuy FossilsJoin Hunts
Matthew Myerscough
Hi all,

Fossils from Aust last night - pleased with the 2 verts which I found in the shingle.

Few other bits of bone.  Last pic I think is bit of a vert.

Cheers

Matthew

20190917_175648.jpg  20190917_175617.jpg  20190917_175705.jpg  20190917_175714.jpg  20190917_175746.jpg 
Quote 0 0
Dirty Pete
Hi Matthew,
Interesting colour contrast, the RH one is typical Westbury fmt, black and worn. The LH one, beige and less worn presumably from higher up the sequence...but where? I found a beige one there years ago embedded in a limestone and seeing your beige vert has made me curious.
IMG_1857.jpg 
Cheers
Pete
Quote 0 0
Matthew Myerscough
Hi Pete,
Yes it is interesting.  Thanks for the photo.  The beige ones are nice.
Popped back last night for a further search and found this, thought it was a broken Ichthyosaur vert until I got home and realised it is actually a complete vert.  Can see the outer surface of the bone on the edges.  The shape is not like the others I have collected, about half as wide as it is long (rectangular).  Very concave.
Any ideas?  I've had a look at shark but they seem circular.  Crocodile perhaps?  
Many thanks
Matthew
20190921_084737.jpg    20190921_084723.jpg  20190921_084646.jpg  20190921_084705.jpg  20190921_084655.jpg  20190921_084649.jpg  20190921_084639.jpg  20190921_084609.jpg  20190921_084559.jpg  20190920_184429.jpg 
Quote 0 0
Dirty Pete
Hi Matthew,
Looks like a badly worn ichthyosaur centrum to me. Pic #7 shows a broad swathe of cancellous bone structure which suggests the overall shape of the centrum is not original. The only other relatively common tetrapod found at Aust is Pachystropheus rhaeticus and it looks nothing like that. I know of no crocodiles mentioned in the literature. 

Here's a relatively fresh plesiosaur vert from Aust with a smooth outer surface to give you some idea what I'm talking about.

IMG_1859.jpg 

Cheers
Pete
Quote 0 0
P King Chef
The beige ichthy verts come from the mud drape found at the base of the bone bone bed. I've got a few of those and one still in the block of mud drape. It's in the greenhouse at the mo so when the light is better I'll post a pic.
P1000216 (600x450).jpg 
You can probably just make them out on the bottom shelf, also note the bi-coloured plesi vert middle r/h side.
Pete

At work I have to make a lot of sacrifices.
It's one of the benefits of being a Druid.
Quote 1 0
Dirty Pete
Bi-coloured vert, assume it must have been lying across some chemical interface during diagenesis, fascinating.... 
Quote 0 0
P King Chef
Here's those pics of the mud drape block as promised.
1. Top of block.
20190924_153700(0).jpg  Pic 2.
Back of block.

20190924_153751.jpg 
Pic 3.
Tan ichthy vert.

20190924_153711.jpg 
Pic 4&5.
Also on this block are a Severnichthys jaw and a small ichthy rib, also both tan.
20190924_153735.jpg 
20190924_153725.jpg 
Pic 6.
And to confuse the issue there is also a partial ichthy vert on the edge which is the normal dark colour. Derived maybe?
20190924_153810.jpg 
Pic 7&8.
Close ups of the bi-coloured plesi vert.
20190924_154903.jpg  20190924_154930.jpg 
Pete

At work I have to make a lot of sacrifices.
It's one of the benefits of being a Druid.
Quote 0 0
Jurassic Ben
P King Chef wrote:
The beige ichthy verts come from the mud drape found at the base of the bone bone bed. I've got a few of those and one still in the block of mud drape. It's in the greenhouse at the mo so when the light is better I'll post a pic.
P1000216 (600x450).jpg 
You can probably just make them out on the bottom shelf, also note the bi-coloured plesi vert middle r/h side.
wow what a collection 
Quote 0 0
Matthew Myerscough
Hi all,
Thanks for all the replies and pictures, very interesting.
Incredible collection P King Chef and great display cabinet!
Cheers
Matthew
Quote 0 0
Dirty Pete
Some very interesting pics Pete, gets stranger by the minute, there's obviously some serious geochemistry going on across the Blue Anchor / Westbury fmt boundary. 
Pete.
Quote 1 0
P King Chef
Hi all,
Thanks for all the replies and pictures, very interesting.
Incredible collection P King Chef and great display cabinet!
Cheers
Matthew

That's only one of three. This one is just ichthy and plesi bones and teeth, the other one in the house has shark, fish and Pachystropheus material in it and the one in the shed has anything too large for the house or not "presentable" for display. 
Pete

At work I have to make a lot of sacrifices.
It's one of the benefits of being a Druid.
Quote 0 0
fossiladdict
Hi matthew,p king chef and dirty pete.
p. king chef your image of light brown vert certainly illustrates its in mudstone base of conglomerate bone bed (tea green marl?) petes and matthews look very pale beige like the ones in the pics i have supplied. although im not 100% about vert except to say its limestone and shelly just like large slab which most certainly was removed from a very thick limestone slab (cotham beds) the base of which is sat on the grey clay.  matthews has been knocking around in shingle for a while will be bleached/weathered could still of come from mudstone,for me i would lean towards cotham beds.

Austs upper triassic/lower jurassic a little sparse compared to Sedbury but sedbury finds  is where i back up my understanding and experience with what i see on this post.
your thoughts guys?  Click image for larger version - Name: 20190926_201036.jpg, Views: 8, Size: 207.94 KB Click image for larger version - Name: 20190926_201351.jpg, Views: 8, Size: 226.07 KB
Quote 0 0
Dirty Pete
Hi fossiladdict,
PKC's slabs show that some light coloured bones/verts are definitely present in the basal bonebed, on or close to the Blue Anchor(Tea green marl)/Westbury unconformity. My beige vert is in a slab of very hard light grey/brownish limestone and yours is in a beige shelly limestone, both obviously not basal bonebed. 
Here's the sequence at Manor farm about a mile away from Aust Cliff:
Screenshot (8).pngPick a limestone that fits best with your observations because I think any could contain verts........

Pete.


 
Quote 0 0
fossiladdict
Hi pete i have a similar geological section here on paper  looking at yours i would go with cross laminated shelly mudstones with marly layers, like i said its the base layer of the first limestone band in the cotham beds the limestone band in my case and opinion is the deepest one you will find at aust and sedbury 12" deep+ in some sections of cliff hope this helps and thanks for sharing your thoughts!  
Quote 0 0
fossiladdict
i might add reading your reply again yours and matthews could be from layers higher up the sequence as i have a few in different matrix.... limestone... shale layers.....  thin clean limestone (no shells etc)
Quote 0 0
Dirty Pete
Always assumed mine was Lias and am still inclined to think so, not so sure about Matthew's, the wear and colour is very similar to PKC's beige bonebed vert, but as you say if it's been kicking around on the beach for years who knows....

Pete.
Quote 0 0
fossiladdict
matthew your not alone when it comes to which layer identification  here is  one  from Aust  found in the shingle. i guess it will remain inconclusive for me too! when you have no matrix (in situ) its hard to say IMO.
The bi-colour image one is bonebed just to give you another example, very odd like pete said geochemistry in action Click image for larger version - Name: 20190927_171952.jpg, Views: 12, Size: 191.78 KB Click image for larger version - Name: 20190927_172115.jpg, Views: 12, Size: 284.38 KB Click image for larger version - Name: 20190927_171334.jpg, Views: 11, Size: 241.56 KB
Quote 0 0
Write a reply...


Discussions on fossils, fossil hunting, rocks, locations, and identifying your finds.
(C)opyright 2019 - UKGE Ltd and UK Fossils - Contact us