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estuary
(Encyclopedia)estuary ĕsˈcho͝oĕrˌē [key], partially enclosed coastal body of water, having an open connection with the ocean, where freshwater from inland is mixed with saltwater from the sea. One type of est...moraine
(Encyclopedia)moraine mərānˈ [key], a formation composed of unsorted and unbedded rock and soil debris called till, which was deposited by a glacier. The till that falls on the sides of a valley glacier from the...mammoth
(Encyclopedia)mammoth, name for several large prehistoric relatives (genus Mammuthus) of modern elephants which ranged over Eurasia and North America in the Pleistocene epoch. The shoulder height of the Siberian, o...Piltdown man
(Encyclopedia)Piltdown man, name given to human remains found during excavations (1908–15) at Piltdown, Sussex, England, by Charles Dawson. The find led to much speculation and argument. Since they were found wit...loess
(Encyclopedia)loess lĕs, lōˈəs, Ger. lös [key], unstratified soil deposit of varying thickness, usually yellowish and composed of fine-grained angular mineral particles mixed with clay. It is found in many reg...Canadian Shield
(Encyclopedia)Canadian Shield or Laurentian Plateau lôrĕnˈchən [key], U-shaped region of ancient rock, the nucleus of North America, stretching N from the Great Lakes to the Arctic Ocean. Covering more than hal...Olduvai Gorge
(Encyclopedia)Olduvai Gorge ōlˈdəwāˌ, –vāˌ [key], a feature of the E African Rift Valley in Tanzania. Erosional processes have exposed geological strata in the gorge dating to the lower Pleistocene epoch, ...Great Rift Valley
(Encyclopedia)Great Rift Valley, geological fault system of SW Asia and E Africa. It extends c.3,000 mi (4,830 km) from N Syria to central Mozambique. The northernmost extension runs S through Syria and Lebanon, th...Hudson Bay
(Encyclopedia)Hudson Bay, inland sea of North America, c.475,000 sq mi (1,230,000 sq km), c.850 mi (1,370 km) long and c.650 mi (1,050 km) wide, E central Canada. Hudson Bay and James Bay (its southern extension) a...Geologic Timescale (table)
(Encyclopedia)Geologic Timescale 1 Not an era but the time preceding the Cambrian. ...Browse by Subject
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