30 Bulletin 15 340 



Only fragments of Haleotherium and teeth of Lamna are found in 

 this littoral deposit. 



Sands of Vauroux. The sands of Vauroux are shallow 

 estuary deposits. At the base are white sands, often micaceous. 

 At Btampes they contain Zz^a>z« Thier crisis, Corbulomya triangula, 

 and, at Vauroux, Syndosmya elegans. Although species of Pota- 

 mides and Cyrena were also found, these beds are not as a rule 

 fossil if erous. The sands of Vauroux were first described by 

 Mayer* in 1864. 



Sands of Piert'efitte. The best secftion of the sands of Pierre- 

 fitte is in a sand quarry near the hamlet of Pierrefitte. A photo- 

 graph of this quarry, taken by the writer in 1900, is shown on 

 the opposite page. This vshows the manner in which these fine 

 sands change laterally into coarser material. The sands are very 

 white, and rest on a coarse gravel bed containing eroded frag- 

 ments of shells. Some estuary species are found, but the fauna 

 is in general marine. Corbulomya triangula and species of 

 Murex and Fusus are ver}' common, but the characteristic species 

 is Cardita Bazini. The fauna has been described in detail by 

 Professor Stanislaus- Meunierf and M. Cossmann.;}: 



Sa7ids of Saclas. The sands and gravels of Saclas are not 

 fossiliferous, except for teeth of Lamna. The sands are developed 

 to the south of Etampes. 



Fontainebleaii sandstone. The sands of Ormoy (Fontaine- 

 bleau sandstone) are of great economic importance. It is of this 

 stone that Paris is built. Fossils are rare and usually in the form 

 of casts, but, occasionally, when the stone has weathered and 

 crumbled into fine sand, fossils can be obtained. Among these 

 are Cerithhim plicatutn, Potamides Lamarcki, Mtirex conspicuus, 

 Cardita Bazini and Cytherea incrassata. 



*Journ. de Conchyliologie, 1864. 



t Sables superieures de Pierrefitte, Coinptes refidus de V Acad, des Set. 

 t. LXXXIX, p. 611. See also Meunier et Lambert, Recherches strati- 

 graphiques et paleontologiques sur les sables marins de Pierrefitte, pres 

 d'Etampes, Nouv. Arch.du Mus., 2eme ser., t. Ill, pp. 235-268, pi. 13 et 14. 



XMhn. Soc. Geol. Fr., 3eme sen, t. 3, pt. i, 1884. 



