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Triassic rocks extend eastward from the World Heritage Site’s western boundary at Exmouth, where seasonal Jurassic Coast Cruises provide excellent views of the coastal exposures. Sidmouth's seafront buildings contrast sharply with the ochre-colored cliffs of Triassic rocks that rise nearby. Thanks to this fortuitous geologic happenstance, visitors can journey through 185 million years of Earth history while exploring the beautiful Jurassic Coast. The time gap is larger to the west, where the underlying rocks are older than those to the east. The contact between the top of the tilted section and these Upper Cretaceous layers is thus an unconformity. Then, sea level rose and Upper Cretaceous chalks, sands and clays accumulated atop the inclined layers. “In the mid-Cretaceous, tectonic activity gently tilted the Mesozoic sedimentary layers down to the east. The sediments that filled the basin are several kilometers thick along portions of the Dorset Coast, and form three broad rock groups: a basal stack of Permian to Triassic “red beds” a middle sequence of Jurassic to Early Cretaceous marine mudstones, sandstones and limestones that accumulated as the basin deepened in response to the rifting of Pangea and an uppermost group primarily composed of Upper Cretaceous to Paleogene chalks. In one of these, the Wessex Basin, whose rocks today cover more than 20,000 square kilometers of southern England, layer upon layer of sediment accumulated from the late Permian to the Paleogene.
#Mesozoica jurasico series#
“Throughout this era, a series of sedimentary basins existed in the vicinity of the modern English Channel. These vibrant sedimentary rocks record one of the world’s best stratigraphic sequences from the Mesozoic Era, which lasted from 252 million to 66 million years ago and was distinguished by a rapid diversification of life as well as several major extinctions. Situated along the undulating shoreline between the towns of Exmouth in East Devon and Studland in West Dorset, the Jurassic Coast is renowned for the nearly continuous 185-million-year record of Earth’s history exposed in its sensational seacliffs. More recent erosion, in the Quaternary, formed the coastal landscape as we know it today, leaving outcrops that represent roughly 185 million years of geologic activity. The rocks of the Jurassic Coast formed from layers of sediment that were deposited, tilted and eroded during the Mesozoic. Exploring the “Jurassic Coast” - from its pebbly beaches, windswept walking paths and cozy pubs, to the various museums detailing the area’s long tradition of groundbreaking fossil discoveries - is a timeless and fun-filled adventure. But it’s the rich cache of fossils entombed within these colorful rocks, particularly those of Jurassic age, that led UNESCO to declare this singular shoreline a World Heritage Site in 2001. Thanks to a wide variety of landforms, impressive cliffs ranging in color from ochre to lily-white, and layered rocks representing all three periods of the Mesozoic Era, this 155-kilometer-long coastal strip has long been recognized as an important place in the study of earth science.
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Just a few hours' drive from London, along England’s southwestern shore, stretches a stunning expanse of coastline with a geologic story as captivating as its scenery. Travels in Geology: Mesozoic masterpiece: England's Jurassic Coast