588 



occur at Black Head, west of Babbacomb ; the sixth mile-stone 

 between Teignmouth and Torquay ; near the village of North 

 Whilborough, and at East Ogwell. 



The author then describes the phaenomena, which appear to have 

 accompanied the disturbance of the strata at diiFerent periods, be- 

 cinning: with those considered to be most recent. 



The undulations and deep combs in the new red sandstone, he 

 says, are not due solely to denudations, but to elevations and depres- 

 sions of the beds while the formation was beneath the sea. On the 

 surface there are no indications of disturbance, the angular irre- 

 gularities having been rounded before the district became dry land. 

 The Watcomb Fault, however, he conceives, was produced by a 

 subsequent operation, as it preserves its angular outline ; and other 

 instances are mentioned of unobliterated faults. 



Mr. Austen next describes, with reference to this part of the sub- 

 ject, the raised, marine beds in the estuary of the Exe, the raised 

 beaches at Hope's Nose, the Thatcher, and to the west of Berry Head ; 

 he mentions also those which occur at intervals along the southern 

 coast of Devon. 



Another system of disturbances, the author assigns to the tertiary 

 era, because it appears to have been in operation, during the time, 

 when the Haldon and Blackdown tertiary beds were formed. The 

 Haldon strata exhibit the following proofs of disturbance : — 



1 . A partial destruction of the chalk, followed by the formation of 

 a breccia of angular flints and sand. 



2. The breaking up of this breccia and the production of a stratum, 

 consisting of chalk flints, the breccia, quartz, granite and other rocks, 

 all rounded. 



Mr. Austen then offers some observations on the probable changes 

 in the extent of dry land during the deposition of the secondary sy- 

 stems, indications of which, he conceives, are traceable in the charac^ 

 ters, and the thinning out of the formations between the chalk and 

 the new red series. In alluding to the faults which affect the new 

 red sandstone, he says, that the greater part of them may belong to 

 the tertiary epoch. 



In the older formations, the evidences of disturbance during 

 periods anterior to the new red sandstone, are referred chiefly to the 

 unconformable position of the culmiferous strata with relation to 

 the transition ; and consequently the disturbances, which gave the 

 slates their present position, must have taken place anterior to the 

 deposition of the culmiferous strata. 



With respect to the connexion between the age and the direction 

 of the faults, the author says the district is too limited for any ob- 

 servations to be of much value. The older disturbances, however, 

 appear to have a north and south direction. The most remarkable 

 east and west fault is that of the valley of the Teign; and if the Wey- 

 mouth Fault be prolonged westward, it would strike the coast of De- 

 vonshire at the mouth of that river. 



Examples of depression as well as of elevation are mentioned in 



