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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 |
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.
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Geological Guide to Grafham Water
Oxford Clay at Grafham Water
At Grafham Water, the Boulder Clay overlain's the Oxford Clay. It is the Oxford Clay were most of the fossils come from, this clay is extremly rich in fossils. The Oxford Clay has been reclassified and now falls under the Peterborough Formation. It is Mainly brownish-grey, fissile, organic-rich (bituminous) mudstones with shelly fauna dominated by crushed aragonitic ammonites and bivalves, including nuculoid and meleagrinella shell-beds. Subordinate beds of pale-medium grey, blocky mudstone exist with several bands of cementstone nodules/concretions.
The basal beds are commonly silty, with Gryphaea-rich shell beds.
Callovian
159 to 165 MYA |
| Brora Arenaceous Formation |
Clynelish Quarry Sandstone |
Brora |
| Fascally Sandstone |
Brora |
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