80 IMr. Dc la Beche on the Geology of Pari of France. 



by a calcareous sandstone, varying- in colour from yellow to white, and con- 

 taininfi- seams and nodules of chert and flint. 



I have not observed this bed with ferruginous grains on the coast; but the 

 calcareous sandstone with cherty seams caps the lias cliffs from St. Come to 

 St. Laurent. From St. Come to St. Honorine the beds rise gradually to the 

 westward ; but at the latter place the strata dip to the N.N.W. and in 

 consecjuence the lias is soon lost under the sea ; and the cliffs from Vierville 

 to Grand Camp are composed almost entirely of the calcareous sandstone with 

 seams of chert. 



The inferior oolite may be traced inland from between Maisy and Isigny, 

 south-eastward, to a small hamlet (on the southern margin of the map) be- 

 tween Falaise and Pont d'Ouilly : the line of junction with the older rocks 

 winds considerably. The oolitic strata rest upon lias from between Maisy 

 and Isigny to within a short <listance from Bayeux. At Veaucelle, near the 

 latter town, they repose upon quartzose gravel beds of the new red sandstone 

 formation ; the bed with ferruginous grains is here seen accompanied by 

 calcareous sandstone, containing- seams of flint, and it also appears in some 

 quarries about a mile north-east from Bayeux ; but the flint occurs there not 

 in seams but in rounded nodules. 



This bed with ferruginous grains contains an abundance of fossils, almost 

 entirely resembling those found in the same rock in the south-western parts 

 of England, particularly at Dundry Hill, near Bristol. Among those which 

 I obtained at Bayeux were the following : — 



Nautilus . Ammonites annulatus. 



Ammonites Brocchii. Greenovii. 



Braikenridffii, Melanea lineata. 



^& 



Brongniartii. Trochus fasciatus. 



Gervillii. Astarte . 



&c. &c.* 



From Bayeux to about three or four miles eastward of Vfflers the inferior 

 oolite rests upon lias ; from thence to Croisy (a little hamlet on the road from 

 Conde sur Noireau to Caen) it rests upon argiUaceous slate and grauwacke. 

 At Croisy the rocks of this formation are remarkably white, so that the cal- 

 careous beds with flints very much resemble chalk. The appearance is more 



* For a more complete catalogue than I had an opportunity of making, see De Gcrville, 

 Journal dc Physique, Tom. Ixxix. page 22, Catalogue D; and Tom. Ixxxiv. page 208, Cata. 

 lo2ue D. 



