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Dimitris

Mollusc? Found on a river outcrop

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Dimitris

Hello everyone!

Today, on my way back from Jurassic hunting, I stopped on a small river I had seen the other time.

 

The location is this
43.297077, 23.397995

Picture shown on google is either irrelevant to exact location or something I have not seen.

Anyway, the location as per Rockd is Early Cretaceous. I cannot find a geological map for the exact location.

The closest known to me is Maastrichtian, 30km SW. In the area around, there are confirmed Eocene formations as well.

The site is characterised by dark shales, which are very loose and easy to split even with bare hands.

The fossil is this:

situ1.thumb.jpg.e7b22e89eedc3a29b641c034a01a65d2.jpg

 

Imprint left from its shell on the other side of the stone.

 

situ2.thumb.jpg.3b1f6e32438911a89138679d69b0cbab.jpg

 

 

I tried to find other fossils in the area around in hope to find something distinctive to determine age.

One brachipod and maybe a part of an ammonite.

thumbnail2.jpg.0143b934fe7bbecfed71344eeadab8cb.jpgthumbnail1.thumb.jpg.77ee9d68ff2fc807f3c637c69c378a2f.jpg

 

 

The place where I found the fossil is this

5ec93571e7353_site2.thumb.jpg.efe370e3dc90b7814b3915d3f59ec340.jpg

 

General aspect on the other side I have not visited, due to the river. It is what is seen from the road.

5ec9356c29f5d_site1.thumb.jpg.04a112825ca3eead9e49db3e1b727e7a.jpg

 

 

 

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Dimitris

Better pictures taken at home

Overall diameter is 22cm.

The last picture was found on the same formation 800m further than the fossil. Looks like fragment of ammonite, though I am not sure.

1.jpg

2.jpg

3.jpg

4.jpg

5.jpg

6.jpg

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caterpillar

Take a look at Inoceramus

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Dimitris

Thanks a lot!

I think the fragment on the field is inoceramus labiatus, which would make the formation Early Turonian, as per this article:

 

http://www.geologicacarpathica.com/GeolCarp_Vol50_No2_193_198.html

 

It refers to Eastern Bulgaria for a different stratigraphic unit, but the inoceramus labiatus shall be indicative for my location  as well.

The outcrop I collected is very small, a stripe of 0.4m wide and 15m long that continues under the river. 300m East though, the formation is more than 30m thick, exposed on a cliff.

I will visit again :)

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Darbi

I'm sure it's Inoceramus. It's quite abundant from Albian and even more from Cenomanian and Turonian in my area (central Kansas). Here's a picture of my Inoceramus from Albian. 

20200524_230250.jpg

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Dimitris
14 hours ago, Darbi said:

I'm sure it's Inoceramus. It's quite abundant from Albian and even more from Cenomanian and Turonian in my area (central Kansas). Here's a picture of my Inoceramus from Albian. 

 

Yes the shell structure close to the scaling cube looks identical.

I was wrong with the age of the formation though. 

On 23/5/2020 at 9:20 PM, Dimitris said:

I think the fragment on the field is inoceramus labiatus, which would make the formation Early Turonian, as per this article:

 

http://www.geologicacarpathica.com/GeolCarp_Vol50_No2_193_198.html

 

It refers to Eastern Bulgaria for a different stratigraphic unit, but the inoceramus labiatus shall be indicative for my location  as well.

The outcrop I collected is very small, a stripe of 0.4m wide and 15m long that continues under the river. 300m East though, the formation is more than 30m thick, exposed on a cliff.

I will visit again :)

It is middle Aptian to Albian as per this geological map I found yesterday.

Sumer Formation: Marl stones, clayish limestones, and sandstones.

 

 thumbnail2.thumb.jpg.d367fa69531947d7f21d2e5cf9237aad.jpg

 

Thanks everyone for your help! I will soon visit again this place. 

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