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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 |
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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 |
Triassic
GEOGRAPHY AND CLIMATE: Sea levels very low.
Graywacke shale, siliceous and Red desert sandstone deposits, arid climate over most of land Pangaea begins to split. Atlantic Ocean opens up.
TERRESTRIAL
ANIMAL LIFE: Reptiles dominant, including the ancestors of the dinosaurs and mammals.
PLANT LIFE: Gymnosperms such as ferns, cycads, gingko's and conifers.
SEA LIFE: Ammonites dominate the seas, Bivalves and Brachiopods are locally abundant but generally rare. All other major invertebrate groups are rare of missing.
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Geological Guide to Aust
Geological Formation at Aust
The uppermost beds at the top of Aust Cliff are marine deposits from the Lower Lias. Just below this level, is the Westbury Formation from the Rhaetic beds. The red coloured beds beneath this, are the older triassic layers of the Keuper and Tea Green beds, these where formed in desert like conditions and are unfossiliferous. Together these two Triassic beds make up the Mercia Mudstone Group and Penarth Group. You may also find the odd hard carboniferous limestone rock which has been washed from both the River Avon brought from the Bristol area and from rocks beneath the river Severn.
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