Geologic Time Crossword

Precambrian eon and the Mesozoic era.
comprising the Triassic, Jurassic, and Cretaceous periods.
the most recent geological era
A unit of time equal to a billion years.
a long and distinct period of history with a particular feature or characteristic.
Population of animals.
a hypothetical landmass in the Southern Hemisphere that separated toward the end of the Paleozoic Era.
broke up into North America.
impact crater buried underneath the Yucatán Peninsula in Mexico.
an entirely landlocked large body of salt or fresh water.
the hypothetical landmass that existed when all continents were joined.
a warm-blooded vertebrate animal.
the megafauna comprises the large or giant animals of an area.
a vertebrate animal of a class that includes snakes, lizards, crocodiles, turtles, and tortoises.
a covering of ice over a large area.
the level of the sea's surface.
a cold-blooded vertebrate animal of a class that comprises the frogs, toads.
a colorless unstable toxic gas with a pungent odor and powerful oxidizing properties.
relating to or characteristic of the Appalachian Mountains in eastern North America.
a mountain range extending about 1500 miles (2400 km) along the border between India and Tibet.
a high mountain, especially a snowcapped one.
the chief mountain range of western North America.
develop gradually.
a limbless cold-blooded vertebrate animal with gills and fins and living wholly in water.
a hierarchical series of organisms each dependent on the next as a source of food.
a plant that has flowers and produces seeds enclosed within a carpel.
a plant that has seeds unprotected by an ovary or fruit.
a fossil reptile of the Mesozoic era, in many species reaching an enormous size.