| Top to bottom: Stromatolitic cyanobacterial blue-green algal accumulations on a piece of wood at the center of each fossil example. From the middle Miocene Barstow Formation, Mojave Desert, California. Specimen in photograph at top is eight and a half inches in diameter by eight and three-quarters inches; middle--two and four-tenths inches in diatmeter by two and eight-tenths inches; bottom--five and half inches in diameter by three inches. All specimens are professionally cut and polished cross-section of the paleobotanic remains. Images courtesy anonymous photographers at specific web pages. |