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50 million Age patterns ammonites ancient archaeocyathids basalt boreholes boundary Britain Callovian Cambrian carbon Charles Lyell chronozone climate continental crust continents correlatron Cretaceous decay deposition diagenesis drnosaurs Earth history environments erosion Europe evidence evolution evolved facies fauna figure formation formed Geographical change geological column geological processes geologist globe Gneiss ice age igneous index fossil isochronous isotopes Jurassic known laid Limestone lithostratigraphy Macdonnell Ranges mammals mantle metamorphic meteorite method metre long metres metres tall metres thrck million years ago million years old mineral molten mountain mrllron named ocean floor ocean ridges Palaeozoic Palaeozorc particles Phanerozoic Pleistocene Portland Limestone Precambrian provinces radioactive recognised rock layers rock type rock units rubidium sample Sandstone schemes sea floor sea level sediment sedimentary rocks sequence shale shelf sea species stage strata stratigraphic strontium System time-correlation traced type section uranrum volcanic younger zone