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Limestone statue of Hemiunu from his tomb. Beleived to have been the architect behind the Great (Khufu’s) Pyramid of Giza, the statue features an unusually realistic style not commonly seen during the time period. Egypt, 4th dynasty. ~2570 BC [1543×2725]

Limestone statue of Hemiunu from his tomb. Beleived to have been the architect behind the Great (Khufu’s) Pyramid of Giza, the statue features an unusually realistic style not commonly seen during the time period. Egypt, 4th dynasty. ~2570 BC [1543×2725]

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Crinoids fossil: crinoids filled the seas during the Carboniferous period and even earlier. Their fossils are frequently found in limestone from the period, giving the Carboniferous the nickname the “Age of the Crinoids [1280 x 1024]

Crinoids fossil: crinoids filled the seas during the Carboniferous period and even earlier. Their fossils are frequently found in limestone from the period, giving the Carboniferous the nickname the “Age of the Crinoids [1280 x 1024]

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Parallel fibers that stiffened a pterosaur’s wing membrane—each just two-thousandths of an inch (0.05 millimeters) thick—are visible in this fossil of a Rhamphorhynchus. The fossil was found in Germany’s Solnhofen limestone beds, where incredibly fine grain preserves minute details [1280×1024]

Parallel fibers that stiffened a pterosaur’s wing membrane—each just two-thousandths of an inch (0.05 millimeters) thick—are visible in this fossil of a Rhamphorhynchus. The fossil was found in Germany’s Solnhofen limestone beds, where incredibly fine grain preserves minute details [1280×1024]