CHAPTER XII. 



GEOLOGICAL EXCURSIONS ALONG PART OF THE SOUTHERN 

 COAST OF DORSETSHIRE. 



VOYAGE FROM YARMOUTH TO SWANAGE — SWANAGE BAY — THE PUR- 

 BECK STRATA FOSSILS OF THE PURBECK STRATA THE PORTLAND- 

 OOLITE GEOGRAPHICAL DISTRIBUTION OF THE STRATA THE 



SOUTH-EASTERN COAST OF PURBECK — THE SOUTH-WESTERN COAST 



WORBARROW BAZ LULWORTH COVE — FOSSIL TREES — DURDLE COVE 



CHALDON DOWNS — RINGSTEAD BAY — THE ISLE OF PORTLAND — 



PETRIFIED PINE-FOREST — FOSSILS OF PORTLAND AND WEYMOUTH 



RETROSPECT — COROLLARY. 



Voyage from Yarmouth to Swanage. — At the 

 distance of about fifteen miles across the chan- 

 nel, from the western extremity of the Isle of 

 Wight, the south-eastern part of the county of 

 Dorsetshire forms a peninsula, which is called the 

 Isle of Purbeck. This district is of an irregular oval 

 form, its greatest length from east to west is between 

 thirteen and fourteen miles, and its average breadth 

 from north to south, seven miles. It is composed 

 of cretaceous, wealden, and oolitic deposits, and a 

 brief notice of its geology will form an interesting 

 and highly instructive sequel, to our survey of the 

 corresponding strata in the " beautiful Island." 



