Science Flashcards
Mold fossil
A fossil in which an impression of an organism is preserved.
Petrified fossil
A fossil in which the hard parts of the organism are replaced by minerals.
Cast fossil
A fossil formed when minerals fill a mold fossil.
Trace fossil
A fossil made by an imprint left behind by an organism.
True-form fossils
Fossils in which the bone and/or tissue of the actual organism are preserved.
Trilobites
They are extinct marine of the Paleozoic Era, which had a segmented body and is found in fossils throughout the world
Brachiopods
Marine invertebrates resembling clams, which were abundant during the Paleozoic era.
Cephalopods
marine mollusks, such as the octopus, squid, cuttlefish, or nautilus, having a large head, large eyes, tentacles
Cambrian Explosion
the sudden increase in the diversity of life at the beginning of the Paleozoic Era.
•Animals that first appeared
–Marine insects (trilobites, scorpion, etc.)
–Brachiopods, cephalopods
–Land insects
–Fish & Sharks (fish are first vertebrates)
–Amphibians
–Early reptiles (not dinosaurs yet)
Cycads
Palm like, cone-bearing, evergreen plants native to warm regions
Angiosperms
Flowering plants
Iridium
A hard, brittle, metallic element which is rare on earth, but is found in asteroids.
Anapsid
Reptiles, such as turtles, having a skull with no temporal openings.
Diapsid
reptiles having a skull with two pairs of temporal openings and including the lizards, snakes, crocodiles, and, dinosaurs
