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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 Llantwit Major

 


Blue Lias at Llantwit Major

 

The lower lias at Llantwit Major are similar to those of Watchet which of course it just across the Bristol Channel. These are early blue lias, but differ from those of Watchet since the fossils are completely different. Giant gastropods, bivalves and brachiopods dominate the rocks, with only a few ammonites.

 

 

Hettangian
201 to 205.7 MYA
E
A R
L
Y

L
I
A
S
Early Blue Lias

Watchet
Lilstock
Hinkley Point
 Quantoxhead
Kilve
Chippel Bay
Doniford Bay
St Audries Bay
Blue Anchor
Pinhay Bay
Llantwit Major
Gileston
Sully
Lavernock Shale Member

Lavernock
Penarth
Redcar Mudstone Formation Early Calcareous Shales Saltburn
Dunrobin Bay Formation Lady's Walk Shale Golspie
White Sandstone Golspie
Carbonaceous Siltstone Golspie




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