Abstracts of Foreign Memoirs. 207 
they are but very imperfectly developed; so that local disturbances 
in the level of the Cretaceous sea must be supposed to have taken 
place even before the deposition of the Baculite-beds. The thick- 
ness of these strata, generally clays and argillaceous marls, very 
poor in organic remains, varies from a few to sixty feet. Nucula 
striata, Roem. (NV. pectinata, Sow.), Leda semilunaris, and Ostrea 
Proteus, Reuss (O. minuta, Roem. ?), have been found in them. 
They are best developed and richest in fossils near Boéh- 
misch-Kamnitz, a locality already mentioned by Geinitz and Reuss. 
They are partly genuine clays, of yellowish-grey tints, laminated 
and soft, not plastic, nor adhering to the tongue, and partly argil- 
laceous marls, greyish-blue, soft, and slightly adhering to the tongue. 
In their chemical constitution, the clays differ from the marls by 
being destitute of carbonate of lime, poorer in alumina and water, 
and richer in silica. These Baculite-strata, strikingly recalling to 
the mind the Gault of Folkestone (from which, however, they totally 
differ as to their paleontological character), rest immediately on 
Quader-Sandstone, without any intercalation of the Pliner. Their 
fossils, especially the Gasteropods, are generally in avery bad state 
of preservation. Sixty species (2 Fishes, 2 Annelids, 5 Cephalo- 
pods, 13 Gasteropods, 39 Bivalves, 2 Brachiopods, and one Coral), 
have been determined among the fossils from Bohmisch-Kamnitz. 
Of these 60 species, the number of those occurring in other Creta- 
ceous localities is in the following proportions :— Germany: Priesen, 
36 ; Luschiitz, 33; Postelberg, 21; Strehlen, 19; Aix-la-Chapelle, 
12; Kieslingswalda, 9; Quedlinburg and Coesfeld, 7 each; Hal- 
dem, 5; Koschiitz, Goslar, and Isle of Rtigen, 4 each; Gosau, 2. 
Galicia: Nagorzany, 15; Lemberg, 13. Switzerland: Perte du 
Rhone and Ste. Croix, 4 each; Geneva, 1. Sweden: Képpinga, 9; 
Inegnaberg, 5. Netherlands: Limbourg, 8 ; Maestricht,4. France: 
Rouen and Uchaux, 5 each; Tournay and Ervy, 2each. England: 
Lewes, 8; Sussex, 7; Folkestone and Isle of Wight, 2 each. 
Counr M. 
Une Reconnatssancr Ghorociaun av Nepraska, par M. Jures Marcov. 8yo. 
pp. 15. 1864. (From the Bullet. Soc. Géol. France, 2° sér. vol. xxi. p. 132, &e.) 
EBRASKA is a new Territory of the American States, lying 
towards the Rocky Mountains, west of Iowa and Missouri, and 
occupying about the central part of North America. M. Marcou, 
who had visited Wisconsin to the north and New Mexico to the 
south, desired to examine the intervening country, and, in spite of 
trouble from civil war and Indians, he and his friend M. Capellini 
crossed the country in two directions in 1863, and gives the result 
of his traverse to the French Geological Society. As in 1862 
Dr. Hayden, the State-Geologist, published the result of a great 
amount of detailed work in the same district, M. Marcou’s observa- 
tions are chiefly interesting in so far as they suggest modifications 
of Dr. Hayden’s results. The Dyas (Permian) and the existence of 
what M. Marcou describes as islands in the Dyassic sea, are believed 
by him to be present in a highly characteristic form in Nebraska, 
