146 



KNOWLEDGE. 



[July 1, 1896. 



newer than the red marl of the Triassic, formed at the 

 bcginuinK of the Moso/.oic Age. " After the deposition of 

 the red marls," says Mr. G. Morton in his excellent 

 geology of the country round Liverpool — to which the 



in the entrance of the estuary of the Bee, and only a few 

 miles from Dove Point), and the peculiar current-bedded 

 strata of which those rocks are composed. 



Upon this undulating country, which presented much 



»«W'4t> 





Fig. 1. — The Submerged Upper Forest Bed, near Dove Point, Chesliire, showing Stratification and Result of 



Wind-Erosion on (Sandhills. From a photograph kindly supplied liy Mr. Charles A. Defieux. 



reader is referred for fuller information — " at the termina- 

 tion of the Triassic, there is a great blank in the geological 

 history of the country round Liverpool. Whatever 

 formations may have been deposited afterwards, no record 

 of them now remains, for denuding agencies were in 



the same surface contours as now — except that the hills 

 were somewhat higher — there came to be laid down by the 

 ice-foot in the fulness of time, all over the district, a thick 

 blanket of clay studded with blocks, borne from the South 

 of Scotland and the North of England on the submergence 



Fig. 2. — The Current-Bedded Strata of the Lower Pebble Beds, Middle Hilbre Island. 



kindly supplied by Mr. Charles A. Pefieux. 



From a photograph 



action, and not only swept them away," but ground down 

 much also of the Trias, Permian, and Carboniferous 

 strata. Fig. 2 exhibits a view of the denuded surface of the 

 Triassic lower pebble beds in Middle Hilbre Island (lying 



of the Wirral, to at least some hundred and fifty feet, during 

 the latter part of the Glacial Epoch. Upon the re-elevation 

 of the land at the close of that dreary period there grew 

 up, by-and-by, the extensive forest whose remains form the 



