CHAPTER VI. 
FAUNAS OF CAMBRIAN AGE. 
The Cambrian faunas of New Jersey are restricted to certain layers 
of the Hardyston quartzite and the Kittatinny limestone. Nowhere 
in these formations are the fossils abundant, while usually no traces 
of organisms can be detected, and those that have been found are 
always fragmentary. In the uppermost beds of the Kittatinny lme- 
stone the Cambrian species disappear, and are replaced by a fauna 
of Beekmantown ( =Calciferous) type, which is usually considered as 
of early Ordovician age. 
The species of the Cambrian faunas will all be considered together, 
although the different localities which have afforded fossils are doubt- 
less of somewhat different horizons. The only fossil horizon of Cam- 
brian age that can be definitely placed in relation to the others is 
the Olenellus bearing bed of the Hardyston quartzite, which is always, 
wherever it has been found, near the base of the sedimentary series in 
New Jersey, and is at a lower horizon than any of the other beds 
carrying Cambrian fossils. At this horizon, however, Olenellus 
thompsoni is the only species which has been identified, although the 
fragments of some other trilobites may be present, as well as some 
more or less indefinite worm burrows. 
PROTOZOA. 
FORAMINIFERA. 
Plate I., Figs. 1-2. 
In the Cambrian fauna at Newton some more or less subglobular 
bodies, whose diameters range from 4 to 6 mm., have been observed, 
which are quite plainly organic in their nature. In some cases these 
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