42 
The Ametican Geologist. 
January, 1900 
particularly in the more calcareous portions of these rocks. It 
is, no doubt, true that certain obscure markings in the lime- 
stone are of organic origin. They much resemble the more 
obscure of the pteropod remains found at Nahant. So far 
as is known, however, no identifiable fossil has hitherto been 
produced. The character of these fragments has been taken 
to indicate the Cambrian age of the rocks. 
2. Middle 
Scale : 2 in = 1 mile. 
Fig. 1. 
Sketch Map, showing Fossil Locality. 1. Lower Cambrian Fossils. 
Cambrian Fossils. 3. Lower Cambrian Fossils in Drift. 
Last spring the writer visited the locality to search for fos- 
sils. The ledges themselves yielded nothing of a satisfactory 
nature. In a fragment, however, a fossil was found which 
was recognized as a pteropod of the genus Orthotheca. In 
the early fall J\Ir. A. W. Grabau found, in the drift near Wey- 
mouth Heights, (map. 3) several fragments bearing fossils. 
These fragments were darker in colour and more sandy than 
the greater part of the North Weymouth slates, so that they 
were not regarded as derived from that area. They served. 
