56 GUIDE TO LOCALITIES. 



The only real centre for studying the Oligocene beds of the 

 Paris basin, in order to see both the palasontological and strati- 

 graphical features, is Etampes. 



Leave Paris (Chemin de Fer d'Orleans) for Etampes, where 

 there are several inns. Train can be taken from Etampes to 

 Etrechy, and the sections are found mostly on the walk back to 

 Etampes. As the exposures are not very clear, we will describe 

 their position fully. Just after passing the railway arch on the 

 main road from Etrechy to Etampes on the right-hand side of the 

 road is a trench about six feet deep for drainage purposes, and 

 the characteristic fauna of this I^^trechy section is seen, with 

 Brachytrema Boblayei, &c. The section is much weathered and 

 not easy to find. 



About one and a-quarter miles from Etrechy, along the main 

 road, on the right-hand side, is the classical Sabliere of Jeurre 

 already described.* Half-a-mile further on, towards Etampes, a 

 farm road branches east to Ville-Martin farm. About a quarter- 

 of-a-mile from this, to the south, in a coppice, is the section of 

 Morigny, a few feet of sand among the roots of trees, full of 

 Potamides trochlearis, Bayania semideciissata and Potamides 

 plicatus and other fossils. 



Another excursion can be made from Etampes to Pierrefitte, 

 taking the bye-road from the former to Pierrefitte, keeping 

 on the north bank of the river Challouette. The section is about 

 a quarter-of-a-mile beyond Pierrefitte. Returning part of the way 

 to Pierrefitte, strike south across the river to Carrefour, where 

 there are two sections. About one and a-half miles over the 

 railway, at the junction of two main roads, is the great quarry of 

 Cote St. Martin. t Afterwards take the road due south to Ormoy 

 la Riviere, about two miles from Cote St. Martin. The fossil- 

 iferous locality is on the top of the hill a short distance east of the 

 village. 



Ante, p. 38. t Ante, p. 43. 



