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In the 1930s, several lengthy scientific papers shed even more light on Alaska's Cretaceous flora. As such, Alaska's Cretaceous plants did not receive serious treatment in the scientific literature until 50 years after its Tertiary flora. [3] No more mammoth remains were found until 1952 when a partially fossilized mammoth tooth was discovered.
During the Cretaceous, tectonic activity in the Arctic Ocean created a series of sediment filled basins, which now host oil and gas deposits, underlying the continental shelf of northern Alaska. Organic-rich shale overlies a major unconformity in the area, acting as the source rock for hydrocarbons.
The Cretaceous (IPA: / k r ɪ ˈ t eɪ ʃ ə s / krih-TAY-shəss) [2] is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest.
Cretaceous polar forests were temperate forests that grew at polar latitudes during the final period of the Mesozoic Era, known as the Cretaceous Period 145–66 Ma. [1] During this period, global average temperature was about 10°C (50°F). higher and carbon dioxide (CO 2 ) levels were approximately 1000 parts per million (ppm), 2.5 times the ...
At the same time, the Laramide orogeny drained the Western Interior Seaway of North America, further contributing to global cooling. [15] Nonetheless, the latest Maastrichtian featured a sharp, pronounced warming, [16] [17] which was caused by the activity of the Deccan Traps. [18] Northern Alaska's mean annual temperature was 6.3 °C. [19]
The Schrader Bluff Formation is a geologic formation in Alaska. It preserves fossils dating back to the Cretaceous period, [4] Fossil remains include Inoceramus and Scaphites. [5] Originally named by George Gryc and others as the marine formation of the Colville Group (abandoned). [3]
About 76 million years ago, a juvenile of one of the largest flying creatures in Earth's history, called Cryodrakon boreas, walked along a riverbank on a lush coastal plain and lowered its ...
The Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after creta, the Latin word for the white limestone known as chalk.