Contact: Cody Mooneyhan
Society of Vertebrate Paleontology
Caption: The histology of the midshaft of Metoposaurus femur is visible using polarized light. Note the thick inner layer of more highly organized tissue (more uniform color), which is called an annulus and corresponds to the dry season, and two layers of less organized bone called zones.
Credit: Photo by D. Konietzko-Meier.
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