_______________________________________________________

___________________
|           |              |               |
YEARS     | NUMBER OF |              |               |    ORDER OF
NECESSARY FOR |  FEET IN  |  GEOLOGICAL  |  GEOLOGICAL   | APPEARANCE OF
FORMATION   | THICKNESS |     AGE      |    EPOCH      | CHARACTERISTIC
|           |              |               |     GROUPS
______________|___________|______________|_______________|__

______________
|           |              |               |
|           |              |               | M B R A F I
|           |              |               | a i e m i n b
|           |              |               | m r p p s v r
|           |   Recent     |               | m d t h h e a
|           |     or       |               | a s i i e r t
|           | Quaternary   |               | l   l b s t e
|           |              |               | s   e i   e s
|           |              |               |     s a   -
______________|___________|______________|_______________|_|

_|_|_|_|_|____
|           |              |               | | | | | | |
|           |              | Pleistocene   | | | | | | |
|           | Cenozoic     | Pliocene      | | | | | | |
5,000,000   |  25,000   |    or        | Miocene       | | | | | | |
|           | Tertiary     | Oligocene     | | | | | | |
|           |              | Eocene        | | | | | | |
______________|___________|______________|_______________|_|

_|_|_|_|_|____
|           |              |               | | | | | | |
|           | Mesozoic     | Cretaceous    | | | | | | |
4,000,000   |  23,000   |    or        | Jurassic      | | | | | | |
|           | Secondary    | Triassic      | |   | | | |
______________|___________|______________|_______________|__

___|_|_|_|____
|           |              |               |     | | | |
|           |              | Permian       |     | | | |
|           |  Palaeozoic   | Carboniferous |       | | |
21,000,000   | 106,000   |      or      | Devonian      |         | |
|           |   Primary    | Silurian      |         | |
|           |              | Cambrian      |         | |
______________|___________|______________|_______________|__

______________
|           |              |               |
20,000,000   |  30,000   | Azoic        | Archaen        |
______________|___________|______________|_______________|__

______________

After what seems an unduly long preparation, we now come to the actual biological evidence of evolution provided by the results of this division of zooelogical science.  But all of the foregoing is fundamentally part of this department of knowledge and it is absolutely essential for any one who desires to understand what the fossils themselves demonstrate.