173 



"L'etage Bajocien des environs de Macon repose toujonrs" says 

 M. de Ferry " siir le Lias superieur, ou plutot sur la couche 

 k Fuco'ides {Chondrites scoparius Thiolliere) avec Ammonites 

 ramanies {Amm. jyrimordialis, Schloth.,) qui participant deja 

 aux caracteres mineralogiqnes des calcaires a Pecten personatus, 

 Goldf., base des formations de Voolithe inferieure." This bed 

 is clearly the representative of the upper portion of the liassic 

 sands of Frocester Hill, (see Fig. IV., p. 169,) and Amm. 

 primordialis, Schloth., is certainly Amm. opalinus, Eeinecke, 

 which I have already shown to be one of the most characteristic 

 fossils of this bed, (p. 169). Having determined the true place 

 of the basement bed of the section, let us now proceed : — 



Calcaires a Pecten personatus is a compact, sandy, yellowish 

 Limestone, often tinted with blue and red stripes, and containing 

 very large siliceous nodules, (chailles) disposed in beds parallel 

 with the strata. The Lumachelles, with Pecten personatus, 

 occupies the superior part ; the lower portion is non-fossihferous. 

 The bed is about ten metres in thickness ; it is used for building, 

 but is a bad material, as it readily breaks up when frozen. 



Calcaire a Entroques is a thick bedded, compact, saccharoid 

 Limestone, the colour of which varies from red (its usual tint) 

 to white or blue. The whole is traversed by thin marly beds, 

 full of Sponges, Polyzoa, and numerous fragments of the tests 

 and spines of Echinides. The great abundance of the spathic 

 debris of Crinoids, with plates and columns of Pentacrinites, 

 contained therein has suggested the name by which it is 

 generally known. It contains the following fossils : — 



Cephalopoda. 



Ammonites Murchisonse, Sow. Belemnites Berthandi, Ferry. 



Belemnites giganteus, Schloth. " curtus, Berthauld. 



Gasteropoda. 

 Pleurotomaria Ebrayana, (V Orh. ? moulds supposed to belong to this sp. 



CONCHIFERA. 

 Pholodomya fidieula, Sow. Trigonia striata, Sow. 



Ceromya, abducta, d'Orb. Myoconcha crassa, Soiv. 



Astarte detrita, Ooldf. Mytilus Sowerbyanus, d'Orb. 



