706 REPORT—1899. 
in every respect with the similar sediments which went on in the Millstone Grit 
and the Coal Measures in later Carboniferous times. 
These two terrigenous formations—the Union and Riversdale—are separated 
from the Millstone Grit and Coal Measures of the same district by a series of lime- 
stones of marine origin, associated with certain sandstones and mudstones, which 
point to a period of subsidence when the Carboniferous sea encroached upon the 
land and deposited limestones, holding abundance of the remains of the sea life of 
those days. The shallow water, estuarine and terrigenous characters of the Union 
and Riversdale formations (eo-Carboniferous) caused by the conditions of deposition 
had ceased for a period, and when the marine conditions which followed had 
ceased, the former conditions recurred, and similar shallow water, estuarine and 
terrigenous deposits, were deposited, and constituted the Millstone Grit and produc- 
tive Coal Measures of the Springhill, Pictou, and Joggins coaltields. For these 
reasons these two eo-Carboniferous formations are so classed. 
In the study of the succession and classification of the fossiliferous and associated 
strata in certain portions of Nova Scotia, together with the life-zones they contain, 
it has been deemed necessary at the present stage of our study to introduce certain 
names to describe better the various formations under discussion, and the following 
synoptical table may serve to present them in a condensed manner :— 
Southern areas Northern areas 
Pleistocene 1 Pleistocene 1 
Uneonformity Unconformity 
Cape John sandstones. 
Pictou freestones. 
= aes Smelt Brook shales, &c. 
Neo-Carboniferous . A ‘ 5 j J -‘\Small’s Brook  (Spirorbis) 
limestones. 
New Glasgow conglomerates. _ 
Coal Measures (Stellarton). Unconformity 
Millstone Grit (Westville). Millstone Grit. 
ae Oneonformity. Unconformity 
Brose Car asters Hopewell and toe fe ne 
Tnconformity. 
{ Union. 
Eo-Carboniferous . \ Riversdale. 
6. Report on the Registration of Type Specimens. See Reports, p. 405. 
1 Of course, not included in Carboniferous, but introduced to show field relations 
and succession. 
