Andrea and Joe return to the boat from Gaulin Reef in San Salvador, Bahamas. See other beautiful phenomena from the Bahamas.
in the Liberty Formation,
The purpose of this study is to look at the distribution of various marine
organisms through space and time in fossiliferous limestone beds of the
upper Ordovician to better understand the environment in which these
organisms were deposited. The rocks of the Ordovician were deposited in a
topical sea environment. There is much evidence that supports the idea
that shoreline fluctuation affects the distribution of marine organisms.
The main process that effects distribution of species is wave base/seafloor
interaction. Areas where wave base is interacting with the seafloor are
areas where water is churning up sediment on the ocean floor and thus
making survival a little more difficult for certain organisms. In keeping
with the readings in this class, this study looks at environmental,
climatic, and geologic change and tries to link these concepts to a change
in species diversity, and abundance. We used a 9 x 9 meter square grid
and took samples at 3 meter intervals laterally (through space in a given
bed) and vertical (through time, going into younger rocks as we go up).
We analyzed these samples to determine how many different fossils were in
each sample. With the numbers we arrived at we created a master species
list for all the samples and compared them. Our findings showed that
within our grid there was not a significant amount of change in
depositional environments , and thus, we found a rather narrow range of
For Further Info on this Topic, Check out this WWW Site: http://www.ucmp.berkeley.edu/ordovician/ordivician.html .
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