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Population of the North American wapiti (Cervus canadensis canadensis) New Mexico, Arizona, and West Texas: Named as the species Cervus merriami in 1902 on the basis of a single skull; in 1978, an anatomical review of a dozen individuals found just enough of a case to consider it a subspecies of Cervus elaphus (later C. canadensis).
The abyssal zone or abyssopelagic zone is a layer of the pelagic zone of the ocean. The word abyss comes from the Greek word ἄβυσσος ( ábussos ), meaning "bottomless". [ 1 ] At depths of 4,000–6,000 m (13,000–20,000 ft), [ 2 ] this zone remains in perpetual darkness.
An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3,000 meters (9,800 ft) and 6,000 meters (20,000 ft).Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains are among the flattest, smoothest and least explored regions on Earth. [1]
The Newark Supergroup, also known as the Newark Group, is an assemblage of Upper Triassic and Lower Jurassic sedimentary and volcanic rocks which outcrop intermittently along the east coast of North America. They were deposited in a series of Triassic basins, the Eastern North American rift basins, approximately 220–190 million years ago.
The Permian ended with the most destructive mass extinction in all of Earth's history. Globally up to 96% of all species may have disappeared. [43] Rugose and tabulate corals became extinct. [44] The cryptostome and trepostome bryozoans also became extinct at this time despite their long history of diversity and abundance earlier in the ...
c. 2.4 Ma – The Amazon River takes its present shape in South America. c. 2.0–1.5 Ma – The basin of the Congo River acquires its present shape. c. 1.9 Ma – Oldest known Homo erectus fossils. This species might be evolved some time before, up to c. 2 Ma ago. c. 1.7 Ma – Australopithecines go extinct.
A whale fall occurs when the carcass of a whale has fallen onto the ocean floor, typically at a depth greater than 1,000 m (3,300 ft), putting them in the bathyal or abyssal zones. [1] On the sea floor, these carcasses can create complex localized ecosystems that supply sustenance to deep-sea organisms for decades. [1]
It does not represent all marine species, just those that are readily fossilized. The labels of the traditional "Big Five" extinction events and the more recently recognised Capitanian mass extinction event are clickable links; see Extinction event for more details. (source and image info)