240 Scientific Intelligence. 



II. GrEOLOGY AND MINERALOGY. 



1. Maryland Geological Survey: Allegheny County ; Wm. 

 Bullock Clark, State Geologist. Pp. 1-323, plate i-xxx, fig- 

 ures 1-15, with Folio Atlas, 1900. — "The present volume on 

 Allegheny County inaugurates a new series of reports dealing 

 with the physical features of the several eounties of Maryland. 

 Not only the geology and mineral resources of Allegheny County 

 will be considered but also the physiography, soils, climate, hydro- 

 graphy, magnetic declination, forests and life characteristics." 

 This is a tempting program and will attract the interest of readers, 

 as will the beautiful illustrations and fine appearance of the 

 volume. 



The following list of formation names is adopted and prelim- 

 inary descriptions of them are given : 



Cenozoic. 



Pleistocene Alluvial, etc. 



Paleozoic. 



Permian . _ ^ _ _Dunkard. 



f Monongahela 

 Conemaugh 

 Allegheny 



Carboniferous \ Pottsville 



Mauch Chunk 

 I Greenbrier 

 [ Pocono 

 f Hampshire 

 I Jennings 



Devonian ._ \ Romney 



| Oriskany 

 (^ Helderberg 

 f Salina 

 | Niagara 



Silurian _ . \ Clinton 



j Tuscarora 

 (_ Juniata 



In the absence of paleontological evidence we shall watch with 

 interest for the reasons for accepting the Niagara as one of the 

 formations of the series in this State. And the geological reader 

 will wonder on what basis the name Salina is applied to the rocks 

 so described in the report, and also on what grounds the 400 feet 

 of rocks "corresponding to the Tentaculite limestone of New 

 York " are separated from the so-called Salina and included in the 

 "Helderberg formation," which is made the base of the Devo- 

 nian, w. 



2. United States Geogolical Survey. C. D. Walcott, Direc- 

 tor. — The following publications of the Survey, bearing the date 

 1900 and for the most part not hitherto noticed, have been 

 received, viz: 



