Geology. 327 
the lowermost. The geology of several of the valleys is illus- 
trated by maps. It closes with a Chemical Report ¢ 
McCatty, of the University of Alabama, giving analyses of coals 
and iron ores, and a list of Elevations (with their distances from 
Memphis), on the Memphis and Charleston railroad. 
5. On Conodonts from the Chazy and Cincinnati Group of 
the Cambro-Silurian, and from the Hamilton and Genesee-Shale 
Divisions of the Devonian, in Canada and the United States ; 
i lates. — 
It has been shown that whilst Conodont teeth do not corres- 
pond in minute structure with, and are far more varied in form 
than, the teeth of any known fish, they yet approach closest to 
those of the Myxinoids. As it is not at all improbable that there 
Was in Paleozoic times as great a development of the Cyclostome 
Ow type of Fishes. At present, however, the facts at hand 
appear insufficient to decide the question.— Quarterly Journal of 
the Geol. Society, Aug., 1879. 
6. Report on the Paleontological Field-work for the season of 
1877; by C. A. Wurre, M.D, (Extracted from the 11th Annual 
Re S. Geol. Survey, F. V. Hayden, Geologist-in-charge).— 
Professor White gives in this Report large additions to the known 
acts respecting the distribution of fossils of the Fox Hill group 
of the Upper Cretaceous, and the Laramie (or Lignitic) Group. 
P 
Union Beds, (3) Eastern Colorado, (4) Northwest Colorado, (5) 
Bitter Creek Valley, (6) Bear River Valley. Professor White 
concludes that the waters of the great Laramie sea were essentiall 
by C. A. Wurrn, M.D. Contributions to Paleontology. No. L 
{t rom the 11th Annual Rep. Surv. for 1877, U. 8. Geol. Surv., 
