Paleo Slide Set: Coral Paleoclimatology
Two sections of a core of Pavona clavus from Urvina Bay, Galapagos (0, 91W).

First the cores are x-rayed so that scientists can see the growth bands. 
Next, segments like the one on the right from Urvina Bay, Galapagos are marked 
for sampling: black lines represent annual bands, while blue and red lines further 
subdivide the year into quarters. The core is then cut along the lines and the 
individual segments analyzed in a laboratory for stable isotope and geochemical signals.

Photo Credits:
Rob Dunbar
Department of Geology and Geophysics, Rice University