diapirn.

1918 Economic Geol. XIII. 467 A peculiar characteristic..is the tendency of the Miocene beds, and especially the salt formation, to pierce through the overlying rocks at certain points on anticlinal axes, thus giving rise to a structure so common that Mrazec [in 1906 Bull. Soc. Sci. Bucarest] has coined the term ‘diapir fold’ to describe it.

1942 M. P. Billings Struct. Geol. iii. 54 Piercing or diapir folds are anticlines in which a mobile core has been able to break through the more brittle overlying rocks.

1942 M. P. Billings Struct. Geol. xiv. 257 In Rumania..the salt, forced upward by orogenic pressure, has penetrated the sediments at the crest of the anticlines to form diapir folds.

1956 Q. Jrnl. Geol. Soc. 112 263 (title) The Ardara granitic diapir of County Donegal.

1970 Nature 25 July 351 The diapirs described by Ewing et al. were salt domes.

1932 Bull. Amer. Assoc. Petroleum Geologists 16 1062 The conception of diapiric structure, that is, folds in which the core unconformably penetrates overlying beds.

1949 Q. Jrnl. Geol. Soc. 104 475 Diapiric upswelling and doming is, in fact, a regular phenomenon in the intrusion of granitic magma.

1970 Nature 25 July 351 Deep seismic reflexion surveys have revealed diapiric structures in deep water.

1923 Bull. Amer. Assoc. Petroleum Geologists 7 581 Mrazec..has written, in French, considerably in detail on the subject of diapirism, and has found this interpretation applicable to many folds.