Origin of Mountains. 437 
7.) The middle or close of the Jurassic period was an epoch 
of displacements, and the making of a series of imperfect syn- 
clinoria along the Triassico-Jurassie areas from Nova Scotia 
to Southern North Carolina, as sufficiently described. 
(8.) During the era of the Connecticut River sandstone (‘Tri- 
assico-Jurassic) a nearly complete sea-border anticlinorium ex- 
isted—a counterpart to the progressing geosynclinal. Its exist- 
ence is proved by the absence of all marine fossils from the beds.* 
(9.) The era closing the Cretaceous, and that of the Tertiary, 
Witnessed but small uplifting and some local displacements of 
the rocks of these eras on the Atlantic border. The principal 
movement was geanticlinal, and it involved probably the whole 
Alleghany region. 
(10.) In the Quaternary there were extended movements of 
geaopiclinal and geosynclinal character which need not be here 
escribed, 
aon 
= In my Manual of Geology, the probable existence of such a barrier is recog- 
nized in connection with the remarks on the phy of the Trenton period in 
America; and it is particularly dwelt upon, and illustrated by a map, en the 
A se i ace ‘ack of oleae SP ‘ 
1 hat was in progress to the west of it. Evidence 
anticlin is given in the following pa this memoir. 
