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Earth 4

name: ______________________________
Across
all geologic time prior to the Phanerozoic eon
a basic unit of the geologic time scale that is a subdivision of an era
the largest time unit on the geological time scale
the division of Earth history into blocks of time - eons, eras, periods, and epochs
the remains or traces of organisms preserved from the geologic past
rocks are placed in their proper sequence of formation for dating
that part of geologic time represented by rocks containing abundant fossil evidence
Down
a scientist who studies fossils and the history of life on Earth
the theory which proposes that Earth's outer shell consists of individual plates which interact in various ways
dome-like structures formed when sticky organic filaments of bacteria and algae trap mud
a rock formed by the chrystallization of molten magma
a complex procedure of calculating the absolute ages for rocks
covered with or affected by a glacier
a gaseous portion surrounding a planet
a major division on the geologic time scale that is a subdivision of an eon
proposed super continent which 200 million years ago began to break apart and formed the present landmasses