Precambrian time — Interval of geologic time from с 3. 8 billion years ago, the age of the oldest known rocks, to 544 million years ago, the beginning of the Cambrian Period. This interval represents more than 80% of the geologic record and thus provides important… … Universalium
algae — algal, adj. /al jee/, n.pl., sing. alga / geuh/. any of numerous groups of chlorophyll containing, mainly aquatic eukaryotic organisms ranging from microscopic single celled forms to multicellular forms 100 ft. (30 m) or more long, distinguished… … Universalium
Fossil — For other uses, see Fossil (disambiguation). Three small ammonite fossils, each approximately 1.5 cm across … Wikipedia
Chert — For the Spanish municipality, see Xert. Chert Chert ( / … Wikipedia
Chert (Gestein) — Cherts (dunkle Lagen) im devonischen Corriganville New Creek Kalkstein, Everett, Pennsylvania Cherts (im Deutschen oft unter dem Namen Hornstein) sind sedimentär und diagenetisch entstandene Kieselgesteine … Deutsch Wikipedia
Superior craton — in the west. The western margin extends from northern Minnesota through eastern Manitoba to northwestern Ontario.The formation of the Superior craton is best explained within the context of 2.72 2.68 Ga accretion of small continental plates and… … Wikipedia
Elso S. Barghoorn — Elso Sterrenberg Barghoorn (* 30. Juni 1915 in New York City; † 27. Januar 1984) war ein US amerikanischer Paläontologe (Paläobotanik). Er war ein international anerkannter Experte für präkambrische Algen Fossilien. Er fand einige der ältesten… … Deutsch Wikipedia
Paleobiology — (sometimes spelled palaeobiology) is a growing and comparatively new discipline which combines the methods and findings of the natural science biology with the methods and findings of the earth science paleontology. It is occasionally referred to … Wikipedia