Bibliographical Notice. S7S 



the Missbun ; and they reoccur on the western slopes of the Rocky 

 Mountains, in South-eastern Oregon (p. 121). 



Notes on the fossils collected by the author from the Carboniferous 

 strata are given at pages 61-67. One of the most abundant is Fusu- 

 lina cylindrica, which abounds in Russia in the upper part of the 

 Lower Carboniferous series (Mountain-limestone) ; but in Kansas it 

 is found (F. cylindrica, var. ventricosa. Meek and Hayden) within 

 about 300 feet of the top of the Upper Carboniferous series (Coal- 

 measures), and occurs abundantly in numerous beds far down in 

 the series. In South-western Iowa and in Missouri it also abounds. 

 F. elongata, Shumard, belongs to the white limestone of the Guada- 

 lupe Mountains, New Mexico, which has been referred to the Per- 

 mian series by Dr. Shumard. 



IV. In the Kansas Valley, the Coal-measures pass upwards con- 

 formably, from magnesian limestones alternating with clays, and 

 containing Solemya, Myalina, Pleurophorus^. subcuneatus, Bake- 

 vellia parva, Euomphalus, Spirigera, Orthosiiia umbraculum{l), 

 O. Shumardianum, Sec, into clays and magnesian limestone, with 

 Monotis Hawni, Myalina perattenuata, Pleurophorusl subcuneatus, 

 Edmondia ? Calhounii, Pec fen, Spirigera, Nautilus excentricus, 

 Bakevellia parva, Leda subscitula, Axinus rotundatus, Bellero- 

 phon, Murchisonia, &c. The latter set of beds are the first that 

 lose nearly all trace of Carboniferous forms ; but the former are 

 not nearly the first that contain genera (such as Synocladia and 

 Bakevellia) peculiar to the Permian rocks of Europe. Here, then. 

 Dr. Hayden is ^inclined to draw a pro\'isional and artificial line 

 between "Carboniferous" and "Permian," if such be required; 

 though apparently he would rather admit the existence, in this re- 

 gion, of an intermediate and transitional group of rocks. In Illinois, 

 however, there is an unconformity between the Carboniferous and 

 Permian beds, according to Dr. J. G. Norwood. In Kansas, above 

 the fossiliferous beds above mentioned, succeed calcareo-siliceous con- 

 glomerate (breccia ?), local and about 18 feet thick ; g}-psiferous clays, 

 95 feet ; red and variegated clays, with seams and veins of magnesian 

 limestone, 60 feet ; all unfossiliferous and doubtfully referred to the 

 Permian series. 



In the Black Hills, the Hmestone of the Carboniferous formation 

 is succeeded by about 400 feet of red, gypsiferous, calcareo-argilla- 

 ceous beds and sandstone, among which is a limestone, of variable 

 thickness, with Spirifer, Pleurotomarice, Macrocheili, and Bellero- 

 phon; and cherty magnesian limestones, vnihMyalina perattemiata, 

 were found at the foot of the Big Horn Mountains, near the head of 

 Powder River. These are possibly Permian. They appear to have 

 been subjected to great denudation (together with the Carboniferous 

 rocks) previously to the deposition of the next series of deposits. 



V. These are red arenaceous and gypsiferous marls, overhang the 

 Carboniferous rocks along the eastern slope of the Rocky Mountains, 

 from lat. 49° southwards, also in the Laramie Plains, and on the 

 west side of the Wind River Mountains, and over a vast extent of 

 country, including the "Wasatch Mountains, south of Lake Utah, also 



