8 PALEOZOIC PALEONTOLOGY. 
of deposition of the Shawangunk conglomerate, which was the begin- 
ning of Silurian time, to that of the Onondaga limestone, which repre- 
sents the first half of middle Devonian time. In the Kittatinny valley 
and in all of the outlying areas, except the Green Pond mountain 
region, the formations are of Cambrian and Ordovician age. The 
greatest range of geologic formations occurs in the Green Pond moun- 
tain region, where there are Cambrian strata as old as any in the Kitta- 
tinny valley, and Devonian strata younger than any in the Delaware 
valley. 
In the following table the geologic formations of Paleozoic age in 
New Jersey have been arranged in sequence, and in the following 
pages their paleontologic characters will be discussed in order, begin- 
ning with the oldest and proceeding to the youngest. In the table the _ 
formations of the Delaware valley area are placed in one column, those 
of the Kittatinny valley and all of the outlying areas, except the 
Green Pond mountain region, in another, and those of the Green 
Pond mountain region in a third column. 
