378 Miscellanies. 



corrected some inaccuracies in the former papers, and that good 

 artists have been employed to furnish the accompanying illustrations, 

 consisting of one hundred and sixty figures. We give some new 

 facts respecting the distribution of the Calcareous strata of the older 

 Cretaceous group in Alabama, derived from observations of Mr. 

 Conrad. The counties of Pickens, Bibb, Greene, Perry, Dallas, 

 Marengo, Wilcox, Lownes, Montgomery, and parts of Clarke, 

 Monroe, and Conecuth are composed chiefly of this formation. In 

 Clarke county the newer Cretaceous rock predominates. The ol- 

 der Cretaceous rock constitutes the long and perpendicular bluff at 

 Demopolis, where it has been ascertained by boring, to be five hun- 

 dred feet in thickness. The more elevated bluff at Erie is composed 

 of the same rock, which is well marked by the presence of Pecten 

 qui nqueco status, and Evogyra costata.' Following the Black War- 

 rior river, the Cretaceous rocks terminate a short distance north of 

 Erie ; and at Tuscaloosa, the bed of the river is formed by red 

 sandstone, and bituminous coal. The Tombeckbe and most of its 

 tributaries traverse the Cretaceous formation, although it is believed 

 that their sources are situated within the Carboniferous limestone 

 supposed to occupy the north-eastern section of Mississippi. The 

 counties of the Chickasaws and Choctaws, and indeed by far the 

 greater part of the whole state of Mississippi, is to be referred also to 

 the Cretaceous group. All the prairies of Alabama and Mississippi 

 have a substratum of the older Cretaceous rock ; while the newer 

 Cretaceous strata prevail only in the southern portion of Alabama, 

 and are never covered with a prairie soil. 



The Nummulite limestone is found near Saggsville, where it con- 

 stitutes the hills. It is porous, or contains spheroidal cavities 

 formed from the decomposition of organic remains. These hills oc- 

 cur at intervals all the way from Claiborne to the vicinity of Jack- 

 son, On the Tombeckbe. On Bassett's creek one of these hills at- 

 tains an elevation of three hundred feet. Myriads of the Nummu- 

 litcs Mantelli are scattered over, the surface of this decomposing 

 rock. 



We now proceed to indicate briefly, the new species of fossils 

 mentioned in this work as well as such as have been more fully de- 

 termined since the author's previous publications. 



The tibia of a bird belonging to the genus Scolopax. In friable 

 green marl near Arneytown, N. J. 



Fossil beaks of Sepicz. 



Nautilus Alahamensis , near Claiborne, Ala. 



