Geological Earth Crossword

Younger rock above older rock
A fossil from a creature that swims in the ocean with multiple rows of teeth.
The science of determining the relative order of past events without necessarily determining the absolute age
Index fossils are used to assist relative dating
An ancient creature, which was technically a fish, complete with scales and gills but had a flat head like a gator.
An animal that feeds only on meat
A rupture in earth's crust that allows magma, volcanic ash and gases to escape from a magma chamber
This fossil class comprises snails and slugs from saltwater, from freshwater, and from the land.
A diverse group of reptiles
A rapid decline of a species
Specific age of something
a technique used to date materials such as rocks or carbon
Determining the relative order of past events, without necessarily determining absolute age
How long ago did humans evolve?
Largest and only populated town of the Svalbard archipelago
What is Earth's age?
A geologic age is a subdivision of geologic time that divides an epoch into smaller parts.
A sharp change in the diversity and abundance of multi-cell organisms
a fossil useful for dating and correlating others
A plant that grows naturally in a tropic environment
A very pale type of sedimentary rock
A group of extinct marine mollusc animals with coiled shells
Marine animals that make up the class crinoidea
Being made up of or formed of sediment
a Solid inorganic substance of natural occurrence