Geology. 127 
6. Observations on the Cretaceous faa of Tecas ; by B. F. Suv- 
marp, M.D., (Tra ns. Acad. Sci. St. . vol. i, No. 4, ; 582).—The 
leading points in Shumard’s paper acm upon the disputed geology of 
the southwest are e these. First he recognizes at the base of the Cretace- 
Kansas as Shumard = and he finds great numbers of Cretaceous fos- 
sils in me —— no leaves 
A 
These beds Meek and Hayden had also placed on a parallel with No, 
2 and 3, of the Nebraska section, as Shumard states. Thus as is seen, all 
explorers concur in the opinion that what Marcou calls Jurassic, at least, 
at the localities where he found fossils, is Cretaoeo ous. There doubtless 
at the tain localities cited, are Cretaceous beds. Shia ard’s paper is an 
important one, and when we consider his opportunity to understand these 
ea in making State explorations, is entitled to great weight. M. 
Die Silurische Fauna des wesilichen Tennessee ; 4to. pp. 97 ; three 
lith hographie and two — a ; by Dr. Ferpinanp RoeMER; res- 
lau, 1860,—In this work Dr. Roemer has noticed and figured 58 spec 
of fossils from the Upper. Silurian rocks of Tennessee. Of these he 
identifies ~ as occurring in the Niagara group of the State _ New 
York, and 28 in Europe, in the Wenlock formation of England and in 
the fenmcnes of the Scandinavian Islands, Gothland and Malmé. The 
most interesting are those which he has described as meen sponges un- 
der the genera Astylospongia Palwomanon and Astreospongia, The 
specimens are spheroidal sub- -cylindrical or cyathiform like the sponges 
of the cretaceous and Jura formations. They are silicified and in the 
polished sections, numerous radiating canals with star-like groups of spi- 
cule are clearly exhibited, presenting an internal structure altogether 
analagous to that of the more recent sponges. ere are six §) 
described, one of which, re ay 7A ia premorsa is identified with the 
mre Sip eolateat). ee oa sponge are rare in 
lurian rocks of Kentucky for which the nin Scyphia dente dentata has been 
ric (See the 2d Report of the Geo. Sur., of Kentucky, page 111.) 
ada a species closely allied to Roemer’s A. sieiiatsonentente, oc- 
; Proceed. Acad, Nat, Sci., Phila., 807, 0. 188. 
+ As we had also shown in Prooeed. ead til ac aaaitin’s pr10e. 
