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| ==Useful links== | | ==Useful links== |
− | * [https://en.wikipedia.org/wiki/System_(stratigraphy) System] | + | * [https://en.wikipedia.org/wiki/System_(stratigraphy) Wikipedia System article] |
− | * [https://en.wikipedia.org/wiki/Geologic_time_scale#Terminology Geologic time scale] | + | * [https://en.wikipedia.org/wiki/Geologic_time_scale#Terminology Wikipedia Geologic time scale] |
− | * [http://www.geol.umd.edu/~tholtz/G102/102bios.htm Biostratigraphy and the geologic time scale] | + | * [http://www.geol.umd.edu/~tholtz/G102/102bios.htm University of Maryland Biostratigraphy and the geologic time scale] |
| | | |
| ==See also== | | ==See also== |