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150 million year old dinosaur footprint in Texas

Stem Cells in Bone Marrow

Bone marrow stem cell, SEM

Bone tissue. Coloured scanning electron micrograph (SEM) of a section through an osteoclast bone cell in reabsorbing bone matrix, showing the cell's nucleus (round, centre). Osteoclasts remodel bone by degrading and reabsorbing it in response to growth or changing mechanical stress. A border of complex branching microprojections (thread-like) can be seen anchoring the cell to the bone matrix. Magnification: x2500 when printed 10 centimetres wide.

Agatized fossilized dinosaur bones are petrified with silica or quartz crystals which gives them their colorful, glassy appearance. This process preserves the actual cell structure of the once living dinosaur.

Dinosaur bones seen in the Quarry Exhibit Hall within Dinosaur National Monument, Utah.

Mosasaur Tooth - Prognathodon Marine Reptile Dinosaur

Dinosaur Footprints from the cretaceus period (120 million years ago) - Torotoro National Park - Bolivia