118 GEOLOGY. 



has generally a red gravelly covering from 5 to 20 feet thick, evidently 

 a surface-wash. An analysis is given. W. W. 



Hartt, C. F. Contributions to t]^e Geology and Physical Geography 



of the Lower Amazonas. Bull. Buff. Soc. Nat. Sci. pp. 201-235, 



10 woodcuts (map and views, «&c.). 



Describes the features of the Erere-Monte-Alegre district and the 



table-topped hills. The flat hills of Monte Alegre are 500 or 600 feet 



high, and of horizontal clays and sands, probably Tertiary. The plain 



at their western foot is of Devonian rocks, with fossils. At the southern 



part of this plain there are ridges, or " serras," of sandstone, the age 



of which is yet uncertain (whether older or newer than the beds of the 



plain). One of the "table-topped hills," named Paranaquara, was 



selected for examination, most previous descriptions of these being 



erroneous. It consists of horizontal beds of clays, sandstones, and 



loams, without fossils ; but the author thinks that they may be Tertiary. 



W.W. 



. Eeport of a Eeconnaissance of the Lower Tapajos. Bull. 



Cornell IJniv. vol. i. no. 1, pp. 11-37, 1 plate (plan). 



Describes various rocks noticed along the river — Porphyry, Carbo- 

 niferous beds (with analysis of limestone) partly fossiliferous (marine 

 shells and plants), and beds probably of Tertiary age. There is as yet 

 no evidence to show whether coal exists on the Amazonas or not ; but 

 the extent of the Carboniferous basin suggests the advisability of a 

 government survey. W. "W. 



Hatden-, Dr. P. Y. Annual Eeport of the United-States Geologi- 

 cal and Geographical Survey of the Territories, embracing Colorado, 

 being a Eeport of Progress of the Exploration for the year 1873. 

 Pp. xii, 718, 94 plates (maps, views, sections, and fossils). 8vo. 

 Washington. 

 Part I. Geology, Mineralogy, and Mining Industry. General Re- 

 port, by Dr. Hatden, and the following Eeports on special districts : 

 — on the Middle Park Division, by A. E. Maevlne, pp. 83-192, with 

 analyses of lignitic coals and details of sections ; on the South-Park 

 Division, by Dr. A. C. Peale, pp. 193-273, with details of sections and 

 catalogues of minerals and rocks ; on the San-Luis Division, by F. M. 

 Endlich, pp. 275-361, with mining geology and mineralogical notes. 

 . Part II. Special Eeports on Palaeontology, see ^os^, under Lesquereux 

 (Botany) and Cope (Vertebrata). Part III. Zoology. Part IV. Geo- 

 graphy and Topography, with lists of heights. Appendix : on the 

 Gold-Hill Mining Eegion and its Telluride Ores. W. W. 



Heineich, Oswald J. The Midlothian Colliery, Yirginia. Trans. 

 Amer. Inst. Min. Eng. vol. i. p. 346. 

 A section of the beds is given at p. 347. 



Hilgard, Prof. E. W. Note on Lignite Beds and their rnder-clays. 

 Amer. Journ. ser. 3, vol. vii. pp. 208-210. 



