# Eons of time (please check the values)

```Good day.
I was always wondering how to imagine those terrific amounts of geologic time
in paleontology. In Jurassic park book, Crichton uses (throught the main
character Alan Grant) this comparison: if you imagine that one human life (60
years) would shrink into a single day, then it would still be 3652 years from
the day of Velociraptor's death...Well, this is an interesting mean of making
the lenght of such period more acceptable. So I made my own table of important
dates in geo/paleo history, by a simple calculation (number of years/25500,
because I count with 70 years = 1 day, so 70 x 365 as that is closer to an
average lifetime of people in "EurAm" region). So the meaning of numbers is: If
a human life lasting 70 years would shrink into a single day, than from the
event on the left (actuall time in the middle) would be (number on the right)
years. Sorry for any incidental mistakes, in advance. As always, any comments
appreciated.

Big Bang      13.700.000.000 yrs.  536 203 yrs.

Earth age      4.600.000.000 -"-   180 039 -"-

Firm sediments 3.960.000.000       154 990

Life           3.850.000.000       150 684

Eucaryots      2.100.000.000        82 191

Cambrian         542.000.000        21 213

Chordates        530.000.000        20 784

Ordovician       488.300.000        19 111

Land plants      475.000.000        18 591

Silurian         443.700.000        17 366

Land animals     428.000.000        16 752

Devonian         416.000.000        16 282

Insect           390.000.000        15 264

Amphibians       365.000.000        14 285

Carboniferous    359.200.000        14 058

Reptiles         340.000.000        13 307

Permian          299.000.000        11 702

Triassic         251.000.000         9 824

Dinosaurs        235.000.000         9 197

Mammals          225.000.000         8 806

Jurassic         199.600.000         7 812

Birds            147.000.000         5 753

Cretaceous       145.500.000         5 694

Flowering plants 140.000.000         5 479

Warmest climate   92.000.000         3 600

K-T, Paleocene    65.500.000         2 563

Eocene            55.800.000         2 184

Cetaceans         55.000.000         2 152  (147 BCE)

Oligocene         33.900.000         1 327  (678 CE)

Miocene           23.030.000           901  (1104 CE)

Last c. m. w apes 13.000.000           509  (1496 CE)

Ardipithecus       5.800.000           227  (1778 CE)

Pliocene           5.330.000           208  (1797 CE)

Genus Homo         2.300.000            90  (1915 CE)

Pleistocene        1.810.000            71  (1934 CE)

Homo sapiens         170.000             6 y 238 d

Human culture         36.000             1 y 149 d

Altamira culture      15.000                 214 d

Holocene              10.000                 143 d

Alphabet               3.500                  50 d

Christian year "O"     2.005                  28 d

First dino description   181                2 d 14 h

Interesting numbers. What does a single human life mean compared to geologic
history...

____________________________________________________________
http://www.seznam.cz - e-mailová schránka 1000 MB

```