era or epoch
the oldest era of the phanerozoic eon
Paleozoic Era
Dominant Mesozoic land vertebrates
Dinosaur
A large division of geologic time, but smaller than an eon
Era
grooves in solid rock formations made by rocks that are carried by glaciers
Glacial groove
an oxygen-poor environment where, over a period of time, decaying plant material changes into coal
Coal Swamp
The current epoch of geologic time that began 10,000 years ago
Holocene epoch
Mesozoic flying reptile with large, batlike wings
Pterosaur
The longest unit of geologic time
Eon
a body of water formed when ocean water floods continents
Inland Sea
the extinction of many species on Earth within a short period of time
Mass Extinction
The middle era of the Phanerozoic eon
Mesozoic Era
Mesozoic marine reptile with a small head, long neck, and flippers
Plesiosaur
A division of geologic time smaller than a period
Epoch
a landform that connects two continents that were previously separated
Land Bridge
the separation of a population of organisms from the rest of its species
geographic isolation
The first epoch of the Quarternary period
Pleistocene epoch
Large mammal of the Cenozoic Era
Mega-Mammal
A unit of geologic time smaller than an era
Period
an ancient landmass that separated into present-day continents
Supercontinent
Scientist hypothesize that volcanism and _____ caused mass extinction of dinosaurs
meteorite impact
The youngest era of the Phanerozoic Eon
Cenosoic Era
Walked with their legs positioned directly below their hips
Dinosaur
a period of time when a large portion of Earth's surface is covered by glaciers
Ice Age
Separated populations of species involve in different ways as they adapt to
different environment
volcanic eruptions led to dust in atmosphere, plants died, animals died - this species could not adapt to the changes
Mesozoic vertebrate species