Thin Section of Dinosaur Bone
The circular patterns are the "concentric lamellae" of the "Haversian Canal" in the center. Most of the Haversian
canals in the fossil bone are filled with quartz or calcite. In live bone they are open and in thin section would appear dark. The colors in
these images are due to the polarized light used to document crystalline orientation. The blues and yellows are more pronounced in the fossil
bone because of the stronger optical properties of quartz over the calcium phosphate of living bone. The black specks are called "Osteocytes"
and they are also preserved in the fossil.
Transmitted Polarized Light with a Red Plate Compensator
Significance in the Environment:
Chinsamy-Turan, Anusuya, THE MICROSTRUCTURE OF DINOSAUR BONE, Johns Hopkins Publisher, 2005