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Euan's Paleo Blog

Oxford Clay- a fosil hunters friend

Posted on July 6, 2014 at 11:20 AM

Peterborough is one of the most important Late Jurassic (Callovian to Oxfordian) marine sites in the world, and has provided some of the most complete and well- preserved marine reptile skeletons ever discovered.

Even today, new discoveries are beng made in it, for example, not more than a few years ago, a completely- new genus of Pliosaur was discovered in Kings Dyke. It was named Pachycostasaurus dawni, and was unusual for the high degree of bone ossification in its skeleton, mostly towards the animals front end. The discovery has surprised Palaeontologists, as they didn't expect a new genus to be found in the Oxford Clay- after all, its the best studied Late Jurassic community. It was suggested that Pachycostasaurus was perhaps a benthic feeder, hunting for bottom- dwelling decapods (crustaceans, like shrimps and lobsters) and molluscs.

 So, on the upcoming visit to Kings Dyke next Saturday, look out for any remains of this animal. For anyone who wants additional information on this animal, search for "A pliosaur (Reptillia, Sauropterygia) exhibiting pachyostosis from the Middle Jurassic of England" published in the journal of the Geological Society. If you do not have access to the journal, try and search for it as a Pdf.

Just to show you how diverse the Oxford Clay reptiles are, here's a list of some of the known species:

  1. Opthalmosaurus icenicus
  1. Tricleidus seeleyi
  2. Muraenosaurus leedsi
  3. Muraenosaurus platyclis
  4. Cryptoclidus oxoniensis
  5. 'Picrocleidus beloclis'- now not considered a valid genus and species
  1. Pliosaurus andrewsi
  2. Liopleurodon ferox
  3. Peloneustes philarchus 
  4. Simolestes vorax
  5. Marmornectes candrewsi
  6. Pachycostasaurus dawni
  1. Steneosaurus durobrivensis
  2. Steneosaurus leedsi
  3. Mycterosuchus nasutus

There are also a large number of Metriorynchid Crocodiliformes, including Dakosaurus maximus, Metriorynchus superciliosum, and the newly named Tyrannoneustes. I have not included an exact list for the Metriorynchid and Geosaurid crocodiles because there is currently scientific debate over which specimens should be considered valid species, and exactly how many crocodillian species there were present in the Oxford clay.

So, with so many marine reptiles around, you have a pretty good chance of finding a few bone fragments. Above, are a few tips to help point you in the right direction.

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Reply Alister Cruickshanks
5:07 AM on July 9, 2014 
Brilliant mate keep up the good work
Reply Vectocleidus 101
2:09 PM on July 17, 2014 
cheers mate :)
Oh, and thnx again for the Ichthy jaw- its an awesome little fragment.