salt gauge from fossil record? Earth surface 70% water; animals 70% water

Sun, 23 Sep 2001 22:27:16 +1000 Gregory Toomey wrote: (big snip)

Geologic Time: Precambrian 5 billion to 570 million years ago

Cambrian, Ordov., Silur., Devon., Miss., Penns., Permian 570-245 million years ago

Triassic, Jur., Cret., 245- 65 million years ago

Tertiary, Quartenary 65 million years ago to present

I would tend to think that science is advanced enough as of 2001 to be able to put some sort of marker or gauge or fingerprint on fossils of the fossil record that would tell us

How large the oceans were and how salty the oceans were during

Cambrian Ordov. Silur. Devon. Miss. Penns. Permian

Triassic Jur. Cret.

Tertiary Quartenary

And some sort of measuring device to tell us how large the oceans were in Precambrian and how much salt those oceans contained.

I find it extremely difficult to believe that scientist do not have some method of attempting to pinpoint the volume of water of oceans and the percentage of salinity throughout Geological Time.

And you can read from a freshman level text, too! Astonishing!

I would think that the types of life starting with the Cambrian would be a gauge in itself as to how much water and its salinity was.

I suspect the reason for the dismal lack of knowledge of how much ocean waters existed and how saline those waters were during various geological time periods is due more to the laziness of the geology community of scientists and due to any 'surviveability of measurement'.