Cambrian, Ordovician, Silurian, Devonian
The best, cute little arthropod that was very diverse and abundant in the Cambrian and Ordovician.
What were trilobites?
Lasted from 299 to 251 million years ago.
What was the Permian Period?
The Taconic Orogeny.
What was the first Appalachian orogeny (in the Ordovician)?
The last of the trilobites perished in a mass extinction at the end of this time period.
What is the Permian Period?
The Sonoma Orogeny helped to form these mountains in the Triassic Period.
What are the Rocky Mts.?
A type of coastal margin with no earthquakes or volcanoes.
What is a passive continental margin?
The earliest reptiles evolved in this period.
What was the Pennsylvanian Period?
The second marine transgression of the Paleozoic Era, in the Ordovician Period.
What was the Tippecanoe?
This volcanism caused the mass extinction at the end of the Triassic Period.
What were the C.A.M.P volcanics?
T-rex and other carnivorous dinosaurs are this type of Saurischian.
What were therapods?
A better name than Cambrian "Explosion."
What is a "radiation?"
This 3rd Appalachian orogeny began in the Pennsylvanian Period and continued into the Permian Period.
What was the Alleghenian Orogeny?
The second Appalachian orogeny in the Devonian Period.
What was the Acadian Orogeny?
The first jaws evolved from this fish body part in the Silurian Period.
What are gill arches?
Dinosaurs with big frills and spikes on their heads, like Triceratops.
What were ceratopsians?
The Paleozoic Period in which the first jawed fish evolved, called Acanthodians.
What was the Silurian?
Most of the world's coal formed in this time.
What was the Carboniferous (Mississippian and Pennsylvanian)?
The volcanism that ended the Paleozoic Era was so much worse because it erupted through layers of evaporites and this carbon-rich former plant material.
What is coal?
The first land animals, also known as "sea scorpions."
What were eurypterids?
this Rocky Mountain Orogeny was in the Late Jurassic Period.
What was the Nevadan Orogeny?
The second mass extinction of the Paleozoic Era occurred in this time period (the first was at the end of the Ordovician).
What was the Devonian Period?
Lowland basins that form next to mountain ranges where coal swamps form.
What are foreland basins?
The name of the volcanism that caused the Permian extinction.
What was the Siberian Traps?
Mammal-like reptiles with 1 temporal fenestrae, 3 ear bones, and differentiated teeth.
What are synapsid reptiles?
This supercontinent broke up in the Triassic Period.
What was Pangaea?