228 Scientific Intelligence. 



No. T 3 . The Geology of Huntingdon County, by J. C. White 

 and other assistant geologists; edited by J. P. Lesley. 472- pp. 

 8vo, with a colored geological map of the county and other folded 

 maps and plates, besides sixty-four page plates, maps and sections. 



No. AA. Atlas (colored) of the Eastern Middle Anthracite 

 Field, containing eight folded sheets relating to the portions of 

 the Lehigh basins in the vicinity of Hazleton and Drifton, Lu- 

 zerne County ; C. A. Ashburnee, geologist in charge. 



The first mentioned of these Reports, on Delaware County, 

 gives an account of the relations of the serpentine and other crys- 

 talline rocks of the County to one another and to the Archaean — 

 points that will be fully discussed in Part 2 by Prof. Lesley. Only 

 the general conclusions are here mentioned. Mr. C. E. Hall states 

 that the investigation has demonstrated, through good sections,, 

 that the schistose gneisses of the region rest unconformably on 

 the Archaean syenite ; that " there are apparently no faults of any 

 consequence within Delaware County to cast a shadow of doubt 

 on the true relations of the schistose rocks to the Laurentian.'* 

 Further, the Serpentine rocks are in more or less flexed strata,, 

 and one in series with part, at least, of the gneisses and other 

 schistose rocks that overlie the Archaean. The author sa} 7 s that 

 " the Serpentine group in this series is the uppermost, or most 

 recent, of the mica schists and gneisses of southeastern Pennsyl- 

 vania; " and also that "the schists and gneisses, except those of 

 the Syenite group [the Archaean], belong to a more recent forma- 

 tion than the Hudson River age " [top of the Lower Silurian]. A 

 table on page 8 represents these gneisses and schists in three 

 series, the Serpentine as belonging to the upper of the three, and 

 all as probably metamorphosed Devonian. The lowest of the 

 three schistose groups contains " coarse mica schists and gneisses, 

 feldspathic and hornblendic gneiss ; " and the upper, serpentine, 

 limestone, garnetiferous schist, corrugated ligneous schists and 

 micaceous sandstones, hornblendic gneiss, and feldspathic mica- 

 ceous gneiss." 



The kaolin of the county is in extensive deposits. The par- 

 ticular feldspathic rock from which it is derived is not yet ascer- 

 tained. 



6. Fossil Scorpion from American Rocks, and other fossils. — 

 Mr. R. P. Whitfield has a paper, illustrated by two plates, on 

 American Silurian Scorpions, Bulletin No. 6 (vol. i) of the Ameri- 

 can Museum of Natural History ; and the same paper contains 

 reproductions of the figures of the Gothland and Lesmahagow 

 Upper Silurian Scorpions. The American species is from the 

 Waterlime beds at Waterville, N. Y., and is named Proscorpius. 

 Osborni (Palceophonus Osborni of Whitfield in Science for 1885). 

 The specimen was at least one and one-half inches long, and re- 

 sembles much the living scorpions in general form. Mr. Whit- 

 field observes, in his concluding remarks, that he is inclined to 

 believe the animal to have been aquatic in its habits, and that we 

 have in it a link between the true air-breathing Scorpions and the 



