400 The American Geologist. December, 1894 
;is previously observed, along a very persistent horizon, known as the 
Ferriferous limestone, usually several feet thick, but occasionally thin- 
ning down to lour inches or less, and in these thin and shaly portions 
the cone-in-cone formation is conspicuously developed. Several hundred 
feet lower in the series the author has found typical cone-in-cone at 
numerous horizons of interbedded thin sandstones and shales. The 
cone-in-cone occupies parts of the shaly layers, and is distinctly calca- 
reous, differing in this respect from the contiguous strata, so that this 
peculiar structure appears to be due to concretionary action, underpres- 
sure, gathering the carbonate of lime and partially expelling the clayey 
matter. Elsewhere the calcareous matter has been sometimes replaced 
by hematite, limonite, pyrites, marcasite. and ferruginous quart/. 
w. v. 
RECENT PUBLICATIONS. 
1. Government and State Reports. 
Smithsonian Report, 1893. contains: The ice age and its work, A. R. 
Wallace; Geologic time as indicated by the sedimentary rocks of North 
America, C. D. Walcott; The age of the earth, Clarence King; Deep-sea 
deposits. A. Daubree. 
Thirteenth Ann. Rept., U. S. Geol. Survey. Part I, Report of the 
Director, J. W. Powell. Part II, Geology, contains: Second expedition 
to Mount St. Elias, I. C. Russell: The geological history of harbors, X. 
S. Shaler: The mechanics of Appalachian structure, Bailey Willis; The 
average elevation of the United States, Henry Gannett; The Rensselaer 
grit plateau of New York, T. N. Dale; The American Tertiary Aphidse, 
S. H. Scudder. Part III, Irrigation. 
U. S. Geol. Survey, Monograph XIX. The Penokee iron-bearing se- 
ries in Michigan and Wisconsin, by R. D. Irving and 0. R. Van Hise. 
Pp. i-xix, 1-534, 37 pis., 1892. 
U. S. Geol Survey, Monograph XXI. Tertiary rhynchophorous Cole- 
optera of the United States, by S. H. Scudder. Pp. i-xi. 1-200, 12 pis.. 
1893. 
U. S. Geol. Survey, Monograph XXII, A manual of topographic 
methods, by Henry Gannett. Pp. i-xiv, 1-300, 18 pis., 1893. 
Bulletins, I'. S. Geol. Survey: No. 97, The Meso/oic Echinodermata 
of the United states, W. B. Clark: No. 98, Flora of the outlying Carbon- 
iferous basins of southwestern Missouri, David White: No. 99, Record 
of North American geology for 1891, N. H. Darton; No. 100, Bibliogra- 
phy ami index of the publications of the U. S. Geological Survey. 1879- 
1892, 1\ C, Warman: No. 101, Insect fauna of the Rhode Island coal 
field, S. II. Scudder; No. 102, A catalogue and bibliography of the North 
American Mesozoic Invertebrata, C. B. Boj'le; No. 103, High tempera- 
ture work in igneous fusion and ebullition, chiefly in relation to [ires- 
