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This is a list of the oldest-known trees, as reported in reliable sources. Definitions of what constitutes an individual tree vary. Definitions of what constitutes an individual tree vary. In addition, tree ages are derived from a variety of sources, including documented "tree-ring" ( dendrochronological ) count core samples, and from estimates.
The Early Woodland period continued many trends begun during the Late and Terminal Archaic periods, including extensive mound-building, regional distinctive burial complexes, the trade of exotic goods across a large area of North America as part of interaction spheres, the reliance on both wild and domesticated plant foods, and a mobile subsistence strategy in which small groups took advantage ...
Megatherium americanum is thought to have been a browser that fed on the foliage and twigs of trees and shrubs using a black rhinoceros–like prehensile upper lip. Despite its large body size, Megatherium americanum is widely thought to have been able to adopt a bipedal posture at least while standing, which allowed it to feed on high-growing ...
When the glaciers began to retreat, the ancient natural communities of the southeast would be the primary source of colonization for the newly exposed areas in the midwest. [5] Warming and drying during the Holocene climatic optimum began about 9,000 years ago and affected the vegetation of the southeast. The prairies and grassy woodlands of ...
Oreodonts were vaguely pig like and about the size of modern goats. Their numbers peaked during the Oligocene. [146] The largest mammals of Oligocene North America were the rhinoceros-like titanotheres. One spectacular example was the abundant Brontotherium of South Dakota, which could be up to 8 feet tall at the shoulder. Despite their early ...
Mesozoic trees (10 P) Pages in category "Prehistoric trees" The following 23 pages are in this category, out of 23 total. This list may not reflect recent changes. B.
Archaeopteris is a member of a group of free-sporing woody plants called the progymnosperms that are interpreted as distant ancestors of the gymnosperms. Archaeopteris reproduced by releasing spores rather than by producing seeds, but some of the species, such as Archaeopteris halliana were heterosporous, producing two types of spores.
Arthropleura (Greek for 'jointed ribs') is an extinct genus of massive myriapod that lived in what is now Europe and North America around 345 to 290 million years ago, [2] [4] from the Viséan stage of the lower Carboniferous Period to the Sakmarian stage of the lower Permian Period.