A gathis), Pinaceae and the Cupressaceae-Taxodiaceae 
complex. Particularly abundant in some localities is 
Inaperturopollenites dubius (Potonie and Venitz) Thom- 
son and Pflug, which is considered to be a member of 
either the Taxodiaceae or Cupressaceae. Brachyphyllum- 
Pagiophyllum represented other common coniferous 
families which are now extinct. Brenner further states 
that these Potomac forests were probably similar in 
character to the warm-temperate gymnosperm and fern 
forests of New Zealand today. In these forests, Podo- 
carpaceae and Araucariceae are the dominant trees with 
a luxuriant growth of ferns characterizing the understory. 
He adds, however, that the presence of cycads and 
schizeaceous plants suggests more tropical conditions 
than exist in present New Zealand forests. 
Two spectra were run from a single piece of amber 
from this O Street sample. The spectra are similar and 
represented by H173 (Plate XV). This spectrum re- 
sembles also Type III from Alaska (Plate XV). 
Kreischerville Amber 
Hollick (1905) reported considerable quantities of am- 
ber from a Cretaceous deposit at Kreischerville, Staten 
Island, New York. He stated that the beds were an 
eastward extension of the Amboy Clay and sand series 
of New Jersey and thus included in the Raritan forma- 
tion. He further continued that they were ‘‘middle 
Cretaceous in age and approximately equivalent of the 
Cenomanian of Europe. . .’’ Hollick and Jeffrey (1909) 
indicated that both the Raritan and Cliffwood (Magothy) 
Formations were present at Kreischerville but that only 
the Raritan beds here were plant-bearing. Unfortunate- 
ly, the stratigraphic position of the Kreischerville de- 
posits has not been investigated recently. 
The amber occurs in strata containing closely packed 
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