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单词 tilloid
释义

tilloidn.

/ˈtɪlɔɪd/
Etymology: < till n.2 + -oid suffix.
Geology.
A sedimentary rock which is similar in appearance to a tillite but is not known to be of glacial origin; a sedimentary rock composed of non-glacial deposits.
ΘΚΠ
the world > the earth > structure of the earth > constituent materials > rock > sedimentary rock > [noun] > other sedimentaries
dunstonea1613
rock phosphate1852
psammite1882
tillite1907
flowstone1925
tilloid1931
turbidite1957
1931 E. Blackwelder in Bull. Geol. Soc. Amer. XLII. 903 For these reasons the scarcity of striated stones in the McGee tilloid* need not be given undue weight. [Note] *Meaning a till-like deposit of doubtful origin.
1957 F. J. Pettijohn Sedimentary Rocks (ed. 2) vi. 265 The non~glacial conglomeratic mudstones or tilloids vary from a chaotic unassorted assemblage of coarse materials set in a mudstone matrix to a mudstone with sparsely distributed cobbles.
1966 Earth-Sci. Rev. 2 251 When there is any doubt about the origin of a till-like deposit, we encourage the use of tilloid, as a non-genetic term.
1977 A. Hallam Planet Earth 87 (caption) Striations on smaller rock bodies may be used to identify those as tillites (glacial till converted to rock) rather than tilloids, which are superficially similar.
This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018).
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