468 Scientific Intelligence. 
Il GroLocy anp Naturat History. 
. The Surface Geology of Ohio; by J. 8. Newserry. 80 pp. 
From the Report of the e Geological $ Survey of Ohio, vol. 11. 
— and the adjoining States, and the conclusions to which his 
arious observations have led him. The successive events of the 
Quaternary, which he gives in the opening part of the chapter, are 
briefly as follows: 
(1.) The period of cold and the great glacier over New England 
and the region west, — of the Ohio, during which the land 
stood se its present lev 
(2.) A ame of lower seach milder climate, retreating glaciers, 
great freshwater lakes; and also of the depos osit of the bowlder 
clay, — - usually thinly laminated in Ohio and contains no 
bowlders ; also of extended forests _ i of the region le 
bare by ra sence of the glacier from Ohio, Indiana and Illinois, 
and of the formation of peat beds, in whieh ‘occur the remains of 
the Mastodon, Elephant, Castoroides, et 
age A furth er subsidence, ranonse the “Mississippi an arm of the 
about them by the waves; when certain drai nage lines were 
determined, as those along the valleys. of the Wabash, Scioto, 
Muskingum and the Beaver. 
(4.) A very gradual “ retirement of the sea,” with “intervals of 
deposition of the materials they transported in the dead water 
which partially filled these valleys;” the gradual draining of the 
lake-region, leaving old shore lines around the lakes with terraces 
or lake ridges in some parts of their circuit 
The eras of elevation, subsidence, sind subsequent — 
indicated in § 1, 2 and 3, and 4, are those which the writer has 
detined as the Glacial, Champlain or Fluvial, and Recent or : Tank 
ae periods. 
marine relics of the era of submergence (§ 3) are stated to 
oni _ the region that is supposed to have been then under the 
o the deposits then made; that is, in the less along the 
Micceunes River, or the beds of Southern Ohio. In fact, the 
ils found are those of the land or of fresh water, and have led 
others to regard the deposits as simply of river origin. Indeed, 
