554 



J. P. BLAKE Otf THE UPPER 



gives a section of the hill of Glos ; and it is specially described by 

 Goubert (29), who, with Zittel, illustrated the fossils found in the 

 sands. Near Lisieux, on the road to Glos, is a quarry very similar 

 to that at Trouville ; for at the base is 6 feet of rubbly limestone, 

 then 5 feet of a large-grained oolite, and on the top 20 feet of rubbly 

 coral rag, almost a Thamnastraean reef in places, and containing 

 Cidaris florigemma abundantly. This, therefore, represents the 

 true Coral Rag. At a distance of about 3 kilom. from this quarry, 

 on the north side of the bridge leading to Glos, is a very instructive 

 exposure. At the base we have a rubbly coral rag of different 

 character, and obviously either overlying the former, or a changed 

 development of its upper part. The beds are all vacuous by 

 the decay of fossils, only internal and external casts being found. 

 The corals are Calamophyllian, and not Thamnastraean : and there 

 is an abundance of Nerincea Gooclhallii, with Littorina muricata, 

 Cerithium muricatum, Trocliotoma discoidea, Chemnitzict deli a?, 

 Natica corcdlina, Nerita sp., Lucina Moreana. and L. balmensis? 

 The whole, by the absence or rarity of Cidaris florigemma, by the 

 abundance of JSlerincece, and by the character of the corals, reminds 

 one of the Novion limestone, though the lithology is different. Over- 

 lying this are oolites and oolitic sands in good beds, 3 \ feet ; next a 

 breccia of limestone-fragments with a hard 15-inch band of blue 

 limestone in the middle, with Pleuromya tellina, a total of 3 feet 

 9 inches ; and then the true sands of Glos. These are marly at the 

 base, but become more sandy by degrees, with hard glauconitic 

 bands or nodules containing fossils; but finally the sand is abso- 

 lutely unfossiliferous, as it has usually been reported to be at this 

 spot. The thickness here seen is 24 feet ; but it certainly extends 

 much further up the hill. The fossils noted are Ammonites serratus, 

 Pterocera polypoda, Trigonia Bvonnii, Gervillia kimmeridiensis, 

 and Pecten midas — a group rather characteristic of higher beds 

 than these are usually considered, and which leads us to look on 

 these sands as partly equivalent to the passage- beds of the coast, 

 especially as Caumont records a section at Pont 1'Eveque where the 

 Trigonia-grit lies immediately on the sands of Glos. The quarry 

 just described does not appear to be the place where the usual fossils 

 have been gathered, as they are said to be all small except the 

 Trigonia. The common locality in fact is seen on the opposite side 

 of the river, where a greater thickness of sand is seen containing 

 bands white with fossils, the principal of which are Trigonia Bronnii 

 and Lucina circumcisa. In any case, the exact position at which 

 the sands commence in reference to the coast-section is clear, the 

 lower beds in the quarry representing the first beds above the Coral 

 Rag, and the blue limestone the hard band (called " Calcaire de 

 Blangy ") in the Hennecqville Cliff. 



IV. The Pats de Bray. 



The older works on this district, such as that of Graves (8), have 

 been rendered out of date by the splendid monograph of M. de Lap- 



