The Ordovician near Bain de Bretagne.

Last year our summer holiday took us to Brittany. This was the occasion for a trilobite trip to the South of Rennes. We concentrated on the Bain de Bretagne, La Dominelais and Le Grand Fougeray area. This zone is typical for the higher Llanvirn. (Ordovicum) and part of the ‘formation de Traveusot’ in the synclinorium of Martigné-Ferchaud.

French friends gave us some hints where to look, but in fact big parts of this area are fossiliverous. If you ride trough these villages, just look for small pits. Local farmers often have a private quarry where they exploit the schist’s. These are used for private roads, drainage of fields and even construction of walls. A quick look at the debris allows you to see if the schist’s contain any fossils. This is often the case and trilobites can be found relatively easy. Do not forget that you are on private ground and ask for permission, she mostly granted.

The Neseuretus tristani is very common over here. You find them mostly in nodules. Locals call these nodules often ‘cercueils’ (= coffins). The conservation is often poor and complete specimens are rare. You can also look for nodules on the fields, but then you need to be there when there aren’t any crops. In one of the quarries we found a Neseuretus of 25 cm in a nodule. In another quarry we visited, it was possible to search in the deeper parts of the formation. Here the conservation of the trilobites is much better and if you are lucky you can catch one of the big guys. We got one of 22 cm. You do not pick up these so easily, the rock is harder here, and getting the big blocks out is hard labour.

Neseuretus tristani

Among the other species we found are Colporyphe roualty and Eodalmatina destombesi destombesi. The first taxa is relatively easy to find, but for the Eodalmatina you need a lucky day.

Colporyphe roualty

Road works can also be interesting. One day we went shopping in the Super U in Bain the Bretagne. They were constructing new roads to access the shop and while my parents were filling their basket, I inspected the heaps with debris. Here also a lot of parts of trilobites were laying around, unfortunately nothing complete. Just when I was leaving, I discovered a Isabelinia glabrato. It’s slightly damaged, but I was very happy to find it.

Eodalmatina destombesi destombesi

Isabelinia glabrato

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