Lo 
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ot 
Liospira americans (Billings). 
Tiospira docens (Billings). 
Liospira progne (Billings). 
Lophospira bicincta (Hall). 
Maclurites magnus Lesueur. 
Nanno kingstonensis Whiteaves. 
Orthis tricenaria Conrad. 
Pianodema subaequata (Conrad). 
Pterygometopus troosti (Safford). 
Strophomena incurvata (Shepard). 
Tetradium syringoporoides Ulrich. 
Of these twenty species, ten occur in the divisions of the Stones River 
in Tennessee. Ostracods are abundant throughout the formation, and gas- 
tropods, cephalopods, corals, and trilobites are common in the lower part. 
A pebbly conglomerate and sandstone occurs at the base of the Pamelia 
and extends northward beyond the limit of the limestone into Canada, 
where it is named Rideau sandstone, 
Near L’Original, Canada, the following species have been collected from 
limestones that are equivalent in age to the Pamelia of New York: 
Leperditia amygalina Jones. 
Leperditia balthica primaeva Jones. 
Leperditia fabulites Conrad. 
Liospira docens (Billings). 
Tiospira progne (Billings). 
Nanno kingstonensis Whiteaves. 
STRATIGRAPHIC CORRELATIONS. 
The sea in which the Stones River beds of the interior area 
of North America were deposited is designated as the Gulf of 
Mexico Embayment'. It came in from the south, spreading from 
the Gulf of Mexico region to Oklahoma and central Tennessee during the 
early Stones River time where the Simpson formation and the Tennessee 
limestone of that age were respectively deposited. The embayment spread 
northward into Kentucky and covered central New York and southern Can- 
ada during the Lebanon time. The basal conglomerate at the bottom of the 
Pamelia (the New York deposit), the thinness of that formation, its 
increasing near-shore facies as it is traced northward into Canada, its 
apparent conformity beneath the lower Chambersburg beds of Valcour age 
in Pennsylvania, and the numerous fossils which it contains that are 
similar to the upper Stones River fossils of Tennessee, has led to the cor- 
relation of the Pamelia with the Lebanon beds, by Ulrich. 
The Appalachian and Champlain troughs had direct connections with 
the Atlantic and the faunas of the one mingled freely with the other, but 
the marked differences of the faunas of the interior basin suggest the ex- 
istence of a barrier separating the eastern and interior Chazyan seas. Cush- 
4See Paleographic Maps, pages 305-307. 
