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hypsithermal
hypsithermal adj.
Brit. 
/ˌhɪpsɪˈθəːml/
, /ˌhɪpsɪˈθəːml/U.S. /ˌhɪpsəˈθərm(ə)l/
[ < Italian ipsotermico (A. Chiarugi 1936, in Nuovo giorn. bot. ital. XLIII. 55)] Geology designating that period of the geologically recent past (c7000 to c600 b.c.) when relatively warm conditions prevailed in the northern hemisphere; also absol./ˌhɪpsəˈθərm(ə)l/ΘΚΠ
the world > the earth > structure of the earth > age or period > [adjective] > quaternary > glacial or boreal > specific warm period
hypsithermal1957
the world > the earth > weather and the atmosphere > weather > [adjective] > of or relating to climate > in the geological past > specific
genial1838
pluvial1868
boreal1876
sub-Atlantic1876
sub-boreal1876
interpluvial1907
intrapluvial1934
Atlantic1935
hypsithermal1957
1957 Bull. Geol. Soc. Amer. 68 1895 The period from 7000 b.c. to 600 b.c. is now known as the hypsithermal interval, rather than by its former but less suitable designations (postglacial climatic optimum, thermal maximum).
1957 Deevey & Flint in Science 1 Feb. 182/2 The long, warm interval spanned by Danish pollen zones V through VIII, which has been dated from approximately 7000 b.c. to approximately 600 b.c., we propose to call the hypsithermal interval. We have changed the spelling of Chiarugi's ipsotermico to conform with the English style of Greek adjectives and to express the customary distinction between hypsi-, high, and hypso-, a height.
1967 P. S. Martin & H. E. Wright Pleistocene Extinctions 135 The onset of widespread aridity [in Australia], which Gill (1955) equates with the Climatic Optimum or Hypsithermal of the Northern Hemisphere.
1968 R. W. Fairbridge Encycl. Geomorphol. 1051/2 Modern deposits may have obtained their maximum growth during the hypsithermal phase of postglacial time.
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