pseudobreccian.
/ˌs(j)uːdə(ʊ)ˈbrɛtʃ(ɪ)ə/, U.S. /ˌsudoʊˈbrɛ(t)ʃ(i)ə/ Geology.
A limestone with a coarsely crystalline, apparently fragmented texture resembling that of a breccia, caused by partial and irregular dolomitization.
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the world > the earth > structure of the earth > constituent materials > rock > sedimentary rock > [noun] > limestone > pseudobreccia
pseudobreccia1833
1833 A. Sedgwick in Rep. Brit. Assoc. 1831–2 583 The hghest mountains [in Caernarvonshire] are distinctly stratified, and not unfrequently contain organic remains, but are associated with masses of pseudo-breccia, compact felspar, and porphyry.
1907 A. Strahan et al. Geol. S. Wales Coal-field VIII. (Mem. Geol. Surv. No. 247) 12 In Callencroft Quarry a pseudo-breccia..is exposed, but dolomitisation appears to have taken place along a fault also.
1926 Times 6 Aug. 8/4 He selected the lower carboniferous rock of Great Britain..consisting of millstone grits, pseudobreccia, dolomites, and cherts.
1969 G. M. Bennison & A. E. Wright Geol. Hist. Brit. Isles ix. 189 The limestones of the D Zone are oolitic or rubbly with pseudobreccias and are highly fossiliferous.
2002 Sedimentary Geol. 146 239/1 They display smooth but irregular margins and criss-cross the lagoonal sediments creating a pseudobreccia in places.
Derivatives
ˌpseudoˈbrecciated adj.
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the world > the earth > structure of the earth > constituent materials > rock > sedimentary rock > [adjective] > calcareous > pseudobrecciated
pseudobrecciated1907
1907 A. Strahan et al. Geol. S. Wales Coal-field VIII. (Mem. Geol. Surv. No. 247) 10 Some of the limestones of Mumbles Head..and Oxwich exhibit pitted bedding-surfaces and a pseudo-brecciated structure.
1974 Jrnl. Paleontol. 48 757/2 The Bird-bear is medium-dark-gray pseudobrecciated micritic limestone.
ˌpseudobrecciˈation n. the structure or state of a pseudobreccia; the formation of a pseudobreccia.
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the world > the earth > structure of the earth > constituent materials > rock > sedimentary rock > [noun] > limestone > pseudobreccia > state of
pseudobrecciation1907
1907 A. Strahan et al. Geol. S. Wales Coal-field VIII. (Mem. Geol. Surv. No. 247) 10 The structure referred to as pseudo-brecciation gives the rock the appearance of having been crushed into small angular fragments and re-cemented.
1963 D. W. Humphries & E. E. Humphries tr. H. Termier & G. Termier Erosion & Sedimentation xiv. 301 The compaction of the sediment was due to migration of ‘imbibed’ water... This compaction is probably associated with the pseudo-brecciation.
1995 Sedimentary Geol. 99 24 (caption) The pseudobrecciation is due to partial replacement by Opal-CT.
This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).
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n.1833