louderbackn.
/ˈlaʊdəbak/ Geology.
A cap of old lava on a tilted fault-block.
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the world > the earth > structure of the earth > structural features > rock formations > [noun] > dome or cap
cap rock1867
dome1900
louderback1930
the world > the earth > structure of the earth > structural features > volcanic formations > [noun] > lava formations > others
pahoehoe1825
malpais1844
spatter rampart1856
ring wall1858
aa1859
pedregal1881
pillow structure1897
pillow1899
pillow lava1903
block lava1914
ring dyke1915
louderback1930
1930 W. M. Davis in Bull. Geol. Soc. Amer. XLI. 299 It seems to me highly appropriate that the lava sheets, which were thus spread unconformably on the Powell surface of the worn-down King mountains, and which now cover the back slopes of the tilted Gilbert blocks, should be called Louderbacks, after their discoverer.
1965 W. D. Thornbury Regional Geomorphol. U.S. xxiv. 473/2 Some of the range have lava caps, called by Davis (1930) louderbacks.
1968 R. W. Fairbridge Encycl. Geomorphol. 679/1 Since the original [lava] flow would normally have filled a valley, the louderback is usually also a form of inverted topography.
This entry has not yet been fully updated (first published 1976; most recently modified version published online June 2018).
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n.1930