The stratigraphic chart of geologic time.

Encyclopædia Britannica, Inc. Source: International Commission on Stratigraphy (ICS)

Paleogeography and paleoceanography of Early Triassic time. The present-day coastlines...

Adapted from: C.R. Scotese, The University of Texas at Arlington

Paleogeography and paleoceanography of Late Jurassic time. Present-day coastlines...

Adapted from: C.R. Scotese, The University of Texas at Arlington

Distribution of landmasses, mountainous regions, shallow seas, and deep ocean basins...

Adapted from C.R. Scotese, The University of Texas at Arlington

A selection of dinosaurs grouped by the geologic interval in which they lived.

Encyclopædia Britannica, Inc.

The Chicxulub crater at the northwestern point of the Yucatán Peninsula was formed...

NASA/JPL

Chicxulub crater, on the northern coast of the Yucatán Peninsula in Mexico, in a...

V.L. Sharpton, University of Alaska, Fairbanks; NASA

Significant events in plant evolution.

Encyclopædia Britannica, Inc.

The Cretaceous Period and its subdivisions.

Encyclopædia Britannica, Inc. Source: International Commission on Stratigraphy (ICS)

The Jurassic Period and its subdivisions.

Encyclopædia Britannica, Inc. Source: International Commission on Stratigraphy (ICS)

The Triassic Period and its subdivisions.

Encyclopædia Britannica, Inc. Source: International Commission on Stratigraphy (ICS)