514 THE DEVONIAN PERIOD, 



feet. Numerous faults occur at tlie locality, the principal of which, 

 on the easternmost side of the most prominent projecting ledge, and 

 whose direction is S. 30° W., is a downthrow of about 50 feet. 



" Directly in front of the ledges, and about half a mile from the 

 shore, is a series of skerries laid bare at low water, called the ' Shag 

 Rocks.' I have not visited them, but the beds of which they are 

 composed have an apparent east-and-west strike, and a high dip to 

 the southward. They are probably the upper members of the Cordaite 

 Shales. 



" Beds of sandstone and shale, similar to those at the Fern Ledges, 

 show themselves on the shore about three-quarters of a mile to the 

 westward. They contain the remains of a few species of plants 

 identical with those occurring at the ' Ledges,' but the beds are 

 higher up in the series. This locality, called the ' Calamite Ledges,' 

 has not been so carefully examined as that to the eastward. I have 

 collected there the following species, nearly all of which are common 

 to the two localities : — 



" Cordaites Robbii, Daws. Extremely abundant in certain layers 

 of black shale, and very finely preserved. — Hphenopteris Hltch- 

 cockicma, Daws. Abundant in detached pinnules. — Pecopteris 

 discrepansj Daws. Apparently rare : have found but a single pinnule. 

 — Cardiocarpum cormdum, Daws. Not infrequent, associated with 

 cordaites, calamites, etc. — Calamites traiisitionis, Goeppert. Abun- 

 dant. — C. cannceformis, Brongn. — Annidaria acuminata^ Daws. 

 Pinnularia dispalans, Daws. Common. — Psilnphylon ? glabrum, 

 Daws. — Stigmaria ficoides (var.), Brongn. — A single specimen 

 with rootlets attached was found by my father, J. W. Hartt, in 

 a bed of sandstone, about half-way up in the section here exposed. 

 — Lepidodendron Gasp>ianum ? Daws. Two or three ill-preserved 

 specimens of a Lepidodendron, which Dawson has referred with 

 doubt to this species, were collected at this locality by Mr Matthew 

 and myself. 



" The sandstone at the Fern Ledges is very compact and hard, and 

 of a gray colour. It contains many plant remains, but usually in a 

 badly preserved state. Thin beds of arenaceous shale, of a fine j] 



texture and dark-gray colour, becoming black sometimes, or passing 

 into light greenish- gray, are interstratified with the sandstones, and 

 these beds are highly charged with plants, which occur preserved as 

 graphite, every nerve and nervule of a fern leaf being as distinct as 

 in a pencil drawing. 



" It had been ascertained several years ago by Gesner, Robb, 

 Dawson, and others, that the beds of the Little River group were 



