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1:250 000 Geological Map

This range of geological maps show the general geology of the area, they come in either folded (for taking on the field), or flat (for wall mounting)
Buy from UKGE

1: 50 000 Geological Map

This range of geological maps show the localised geology, they come in either folded (for taking on the field), or flat (for wall mounting)
Buy from UKGE

Jurassic

GEOGRAPHY AND CLIMATE: Gondwanaland continues to break up, Graywacke, shale and siliceous sediments formed. Continued mountain building. mild, moist climates over most of the land.

TERRESTRIAL ANIMAL LIFE: Reptiles dominant with Crocodiles, turtles, lizards and dinosaurs. Pterosaurs and Archaeopteryx take to the air. Mammals begin to diversify. More advanced insects such as flies.

PLANT LIFE: Cycads, ginkos, conifers, ferns and tree ferns.

SEA LIFE: All major invertebrate groups well represented, ammonites and bivalves successful. Marine reptiles, Ichthyosaurs are Plesiosaurs.

 

Geological Guide to Portland Bill

 

At the top of the cliffs at Portland Bill are the Purbeck beds. These are Cretaceous in age and are part of the Lulworth Formation. Below these are the Portland Beds, from the Cherty Member. Rocks from the Basal Shell Bed can also be seen in blocks fallen from the cliff. These are Jurassic in age. West of the lighthouse, a raised beach can be examined with Mesozoic rocks, as well as granite, bunter and quartzite pebbles (from Budleigh Salterton). This is known as the 'Portland Raised Beach'. Fossils can also be found here, as many of the rocks and pebbles are from the Portland Stone and Purbeck Beds. The latter now tend to be covered in rubble, but once made up the top most part of the quarry.

 

Basal Shell Bed from the Portland Beds of Portland Bill

 

Basal Shell Bed from the Portland Beds of Portland Bill
Portland Raised Beach

 



Portlandian
142 to 147 MYA
Purbeck Lulworth
Formation
Cherty Freshwater Beds
Freshwater Bay
Church Ope Cove
Portland Bill
Poxwell Quarry
Lulworth Cove
Marly Freshwater Beds
Soft Cockle Beds
Hard Cockle Beds
Cypris Freestones
Broken Beds and Caps
Helmsdale Shale

Helmsdale

Boulder Beds Helmsdale
Portland Stone Freestone Series

Dancing Ledge
West Weare
Freshwater Bay
Church Ope Cove
Portland Bill

Cherty Series
Basal Shell Bed
Portland Sand Portland Clay West Weare
West Weare Sandstone
Exogyra Bed
Upper Blacknore Beds
Blacknore Sandstone
Lower Blacknore Beds

 

 


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