Geological Society. 51 



much decalcification and weathering ; near its surface there was a 

 large boulder of Norwegian titaniferous syenite which was super- 

 ficially rotted, and decomposed to a considerable depth. Smaller 

 granitic erratics in the redeposited loess are generally very much 

 rotted. The limestone rubble and stones beneath the loess are 

 strongly calcreted, apparently by material leached out of the loess. 

 In a fissure beneath the loess some mammalian bones were col- 

 lected, including astragali of two species of Gervus. It is argued 

 that the formation and subsequent decalcification of the loess 

 deposit lying upon the Scandinavian drift indicates an Interglaeial 

 lapse of considerable duration, as great as that which Continental 

 geologists call an Interglaeial Period, before the overlying English 

 and Scottish drift was deposited. 



About 2 miles south of the Scandinavian drift-bed several 

 fissures occur in the Magnesian Limestone cliffs and on the fore- 

 shore, rilled with various materials that were transported in front 

 of the earliest ice-sheet that advanced upon this part of the coast. 

 The Author has already recorded the occurrence in these fissures 

 of Upper Permian red and grey marls and dolomites with clay and 

 peaty trees. Continued examination of two of the fissures where 

 they are exposed between tide-marks on the shore, resulted in the 

 finding of a quantity of freshwater mollusca, ostracoda, and fish- 

 remains. Some mammalian remains also occurred, including those 

 of an elephant (probably Elephas meridionalis) and of a vole 

 (Mimomys). 



Vegetable matter has been washed from various parts of the 

 clay. A large number of seeds came from a single patch of clay, 

 and prove to be of Teglian age : they seem to represent a pre- 

 Glacial flora, half of the species of which are either exotic or 

 extinct. Seeds from other parts of the deposit appear to indicate 

 a later horizon, and contain mainly living forms. 



The deposit is a mixed one, and seems to have belonged to a 

 series of late Pliocene and early Pleistocene beds that occupied 

 part of the present area of the North Sea and were torn up by the 

 advancing ice-sheet, like a great glacial erratic, and thrust into the 

 fissures. 



The fact that the Scandinavian drift in Durham contains only 

 stones of Scandinavian origin has been confinnecl, and the marine 

 Arctic shells that occur in it were further collected and a few 

 additions to the faunal list were made. The most interesting of 

 these is Cyrtodaria siliqna Spengler, an American shell which 

 has been recorded hitherto in Great Britain only from the Caith- 

 ness Boulder Clays. 



All the deposits described above are overlain and overridden by 

 the main mass of local Cheviot and Northern drift that caps the 

 cliffs of the Durham coast. 



A suggested correlation of the Durham sequence with the 

 European drifts is attempted, and it is concluded that the fringe 

 of the Scandinavian ice-cap that reached the Durham coast pro- 

 bably corresponds with that of the second and greatest glaciation 



