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Daresie
Could someone help identify these please? My son found the rock sitting in clay in a stream bed. Click image for larger version - Name: IMG_20200605_200608663.jpg, Views: 52, Size: 299.78 KB Click image for larger version - Name: IMG_20200605_200232386.jpg, Views: 51, Size: 362.82 KB
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prep01
Hello and welcome to the forum. These are very worn ammonites from the early Jurassic (180 - 200 million years old. I had a close look at the photos and believe there are also a few braciopods (a type of sea shell) the largest and most complete one showing itself just above the top right ammonite. Well spotted your Son!
Colin Huller
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Dirty Pete
Hi,
Which part of Bristol? They look like Psiloceras planorbis.

Pete.
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Daresie
Dirty Pete wrote:
Hi,
Which part of Bristol? They look like Psiloceras planorbis.

Pete.


Thanks! He found them in the Malago in Manor Valley Woods (south Bristol). Any idea how they would have made it there? From a spring maybe?
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prep01
eroded from river bank upstream
Colin Huller
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Dirty Pete
The Jurassic strata in which your ammonites are found surrounds Manor Woods Valley which is underlain by the unfossiliferous Triassic Mercia Mudstone. The Malago  crosses the Triassic/Jurassic boundary near Headley Park Church. Assuming somebody didn't chuck it in the stream I reckon Colin must be right. It didn't have to travel very far...

Pete.
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