Maeoh 17, 1916] 



SCIENCE 



395 



Osgood 



quarries, as for example, the Lewisburg Stone 

 Company, northwest of Lewisburg and the Jack- 

 son quarry, south of Covington. Dr. Poerste 's 

 name of Brassfield formation is adopted for what 

 was formerly called the Clinton limestone in Ohio, 

 and as the result of recent work by Sehuchert and 

 others it is to be correlated with the Medina 

 rather than the Clinton formation of New York. 

 If this correlation be accepted, then the Brass- 

 field formation is to be transferred from the 

 Niagaran to the Oswegan series of the Silurian 

 system. 



The following classification is proposed for these 

 formations in western Ohio: 



Cayugan series. — Monroe Formation. 



fCedarville dolomite. Lower 15 

 feet shown. 

 Springfield dolomite, 13 feet. 

 A mottled-colored zone which has 

 Niagaran been called West Union, 4 to 7 

 Series. 1 feet. 



Laurel Limestone, 7 to 10 feet. 



Shale zone, 2 to 3 feet. 

 Dayton limestone, 8 to 

 11 feet. 

 Oswegan 1 Brassfield limestone, 26J to 28>2 

 Series. J feet. 

 Cincinnatian Series. Belfast bed at top of Rich- 

 mond formation. 



Th€ StratigrapMc Position of the Sillshoro Sand- 

 stone: Charles S. Pros see. 

 In Highland County in southern Ohio' a sand- 

 stone composed of grains of quartz sand occurs 

 which was named the Hillsboro sandstone by Dr. 

 Orton and regarded as forming the uppermost di- 

 vision of the Niagaran series. In the summer of 

 1915 outcrops were found on the southern slope of 

 Quaker Hill, about five miles north of Hillsboro, 

 which give a better section than any that has 

 previously been described. The hill is capped by 

 the Ohio shale; below this is 13 feet of drab-col- 

 ored compact limestone with the lithologio char- 

 acters of the Monroe formation and containing 

 fossils that occur only in this formation. Then 2J 

 feet of quartz sandstone is exposed which is the 

 Hillsboro, and stratigraphically below this sand- 

 stone is limestone lithologically like the Monroe 

 in which fossils were found that are known only 

 in the Greenfield dolomite, which is the basal 

 member of the Monroe formation. Twelve and 

 ■one fourth feet below the exposed base of the 

 upper sandstone is a 2-foot layer of similar sand- 

 stone which probably has been included in the 

 Hillsboro sandstone and beneath this is nearly 3 

 feet of limestone still with the lithologie appear- 



ance of the Monroe, but fossils were not found in 

 it. Under this zone is porous rock with the litho- 

 logie character of the Cedarville dolomite in which 

 specimens of Trimerella were found, a genus of 

 brachiopod shells that is known only in the Cedar- 

 ville and Guelph formations of North America 

 and the upper part of the Silurian in the Baltic 

 region of Europe. The occurrence of fossils known 

 only in the Greenfield member of the Monroe for- 

 mation in rock lithologically like the Monroe be- 

 low the higher layer of sandstone and the con- 

 tinuance of the rock with the lithologie appear- 

 ance of the Monroe below the lower sandstone is 

 believed to prove that the Hillsboro sandstone be- 

 longs in the Monroe formation like the somewhat 

 similar lithologio Sylvania sandstone of north- 

 western Ohio and southeastern Michigan. 



The Berea Formation of Ohio and Pennsylvania: 



Walter A. Verwiebe. 



The Berea has been studied in Ohio notably by 

 Dr. Pressor, in Crawford county, Pa., by I. C. 

 White, and along the Allegheny river by Charles 

 Butts. In 1915 the author made an attempt to 

 correlate the work of these three investigators. 

 As a result the following conclusions were reached: 



(1) The Berea is represented in Pennsylvania by 

 the Corry and Cussewago formations of White. 



(2) The Corry sandstone increases in thickness 

 when followed eastward from the state line, at- 

 taining a thickness of about 50 feet along the 

 Allegheny Biver. (3) The Corry sandstone be- 

 comes gradually coarser toward the east. (4) 

 A limestone layer is practically always to be found 

 under the Corry. (5) The Cussewago sandstone 

 thins out and disappears from the section about 

 longitude 80° 5' W. (6) The Corry sandstone is 

 represented along the Allegheny River by the 

 sandstone indicated on Mr. Butts's general sec- 

 tion as lying about 160 feet above the sandstone 

 labeled "Berea (Corry)." (7) The Berea is ab- 

 sent along the Allegheny River north of Tidioute. 

 The sandstone regarded as the Berea north of this 

 point is probably the Venango First Oil Sand. 



The Origin of the NewarTc Series in the Philadel- 

 phia District: Helen Morningstar. 

 In the cut made by the Philadelphia and West- 

 em Electric Railway at the De Kalb Street Sta- 

 tion, Bridgeport, Pennsylvania, the lowest member 

 of the Newark Series in the Philadelphia District, 

 the Stockton, is well exposed and consists of alter- 

 nating beds of red and gray sandstone and con- 

 glomerate with pebbles varying from a fraction 



