Dorset dating group

Landslides and the excavation of the clays, used in cement production, exposed not only an abundance of ammonites of varying size, but much larger specimens such as ichthyosaurs and plesiosaurs.Laid down between 185 Ma and 182 Ma years ago in a shallower marine environment that was subjected to much more turbulent weather conditions, the sediments of the Middle Lias are not as muddy as those in the lower Lias, and are much nearer to silt and sand.These rocks produce thin soils that historically have supported a heathland habitat.

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Between the bands of limestone and chalk are wide clay vales with flood plains.

South-east Dorset, around Poole, Bournemouth and the New Forest, lies on younger and less resistant beds: Eocene clays (mainly London Clay), sands and gravels.

The sides of the vale are mainly made from the clays and sands of the upper and lower Lias while younger strata from the Cretaceous Period (145-66 Ma), crown the higher points.

Around Lyme Regis, during the 18th and 19th centuries, the collecting and sale of fossils became a popular occupation.

The site at Trusty's Hill in Galloway was known to be a centre of Pictish culture. In 2006, the mummy of a Scythian warrior was found. Locked in ice, the well preserved mummy was discovered on the border between China, Russia and Mongolia.

(or archaically, Dorsetshire) is a county in South West England on the English Channel coast.In general the oldest rocks (Early Jurassic) appear in the far west of the county, with the most recent (Eocene) in the far east.Jurassic rocks also underlie the Blackmore Vale and comprise much of the coastal cliff in the west and south of the county; and although younger Cretaceous rocks crown some of the highpoints in the west, they are mainly to be found in the centre and east of the county.When these continents collided to form the single super-continent of Pangaea, the sediments on the ocean floor were pushed up and over while the molten rock below the surface was forced out.[Needs section on the Triassic adding] Around 204 Ma Dorset, now 30 degrees north, was under water and the first ammonites (Psiloceras planorbis) appear among the shales and limestones that make up the lower Lias.Dorset's coastline is one of the most visited and studied coastlines in the world because it shows, along the course of 95 miles (153 km) (including some of east Devon), rocks from the beginning of Triassic, through the Jurassic and up to the end of the Cretaceous, documenting the entire Mesozoic era with well-preserved fossils.

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