James Sadler
How do geologists measure the completeness of the fossil record?
I read "The biological explosion at the Precambrian-Cambrian "by James W Valentine and Stanley M. Awramik. On page 311, they discuss how the completeness of the study fossil is measured. They say: "The entire expected from this folder can be estimated from the average rates of sediment accumulation determined from modern marine envirnments shallow parts of the history of rock that have been reliably dated (Sadler 1981). To estimate the probability that 1-my interval leaving a trace in the fallen rock in an isolated community of over 30my, divide the average rate determined for the 30-my intervals by the average for 1-my intervals. For carbonate rocks that yields an estimate of 0.33 ... "Call me a big head, but why is not the rate of sedimentation for 1-my intervals of one-thirtieth of that of 30-my intervals? How can it be anything else?
For He no direct correlation between the two values it seems. As stated, rock accumulated in an isolated over 30my can not be expected to contain 30 separate and complete 1MY intervals. Many, many variations and complex spatially distributed throughout such periods of time to make this vast almost an impossibility. In the case of carbonate deposits, there is a probability of only 1 / 3 that 1MY given interval will be captured in a rock album that spans a range of 30my. You have a 66% probability that something happened to destroy this particular interval along the way, if it has never been provided (maybe some 1MY range has been especially hard hit by drought in the local area where the history of rock under consideration was formed.
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