Jurassic

The start of the Jurassic was marked by the major Triassic-Jurassic extinction event, associated with the eruption of the Central Atlantic Magmatic Province (CAMP).

The geology of the Andaman islands consists essentially of Late Jurassic to Early Eocene ophiolites and sedimentary rocks (argillaceous and algal limestones), deformed by numerous deep faults and thrusts with ultramafic igneous intrusions.

Bath stone is an oolitic limestone comprising granular fragments of calcium carbonate originally obtained from the Middle Jurassic aged Great Oolite Group of the Combe Down and Bathampton Down Mines under Combe Down, Somerset, England.

Above the Spearfish Formation is a thin band of white gypsum, called the Gypsum Springs Formation, Jurassic in age.

The geologic folds comprise three major bands (lithological units) of building that date from three epochs: the Lias (Early Jurassic), the Dogger (Middle Jurassic) and the Malm (Late Jurassic) geologic periods.

It was thus an alternative name for the Early Jurassic epoch of the geologic timescale.

The islands are predominantly composed of Jurassic and Cretaceous intrusive (emplaced ≈160 Ma, ≈130 Ma and ≈94 Ma) granite and diabase.

The basement complex is overlain by the Jurassic Beacon Supergroup, which is itself intruded by Ferrar Dolerite sheets and sills.

The Morrison Formation is a distinctive sequence of Upper Jurassic sedimentary rock found in the western United States which has been the most fertile source of dinosaur fossils in North America.

A 2019 radioisotopic analysis suggests that the Navajo Sandstone formation dates to the early Jurassic and began around 200-195 million years ago.

The Posidonia Shale (German: Posidonienschiefer, also called Schistes Bitumineux in Luxembourg), is an Early Jurassic (Toarcian) geological formation in Germany, northern Switzerland, northwestern Austria, southern Luxembourg and the Netherlands.

The Purbeck Group is an Upper Jurassic to Lower Cretaceous lithostratigraphic group (a sequence of rock strata) in south-east England.

The Solnhofen Limestone or Solnhofen Plattenkalk, formally known as the Altmühltal Formation, is a Jurassic Konservat-Lagerstätte that preserves a rare assemblage of fossilized organisms, including highly detailed imprints of soft bodied organisms such as sea jellies.

The sedimentary layers include the Beacon Supergroup sandstones, siltstones, and coal deposited beginning in the Silurian period and continuing into the Jurassic.

Basement rocks in the area consist of the Late Jurassic Naknek Formation, which is composed of siltstones, and arkosic sandstones 1.7-2 km thick deposited in a marine shelf and submarine fan delta environment during the Oxfordian-Tithonian.

Several million years later, with the arrival of the Jurassic period, the area was covered by a warm shallow sea, which allowed the growth of various corals.

The upper part of the formation, which laterally interfingers with the Moenave Formation to the west, is Early Jurassic in age.