Examples of breccia

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Note the poorly sorted, ungraded character of the lithic breccia.
The fracture zone of the fault mainly consists of fault gouge and breccia.
Simultaneous eruption of ash-flow tuffs resulted in a sequence of interbedded tuffs, sedimentary breccias and andesitic lavas.
Lichen from the breccia outcrop was analysed for reference.
These breccias are composed of angular blocks up to 1 m in diameter with thrombolite and stromatolite textures.
The floors of the resurge gullies become covered with resurge breccia and turbiditic sediments.
The fluids would also have contributed to the dolomitized matrix which constitutes part of the breccia.
Pyroclastic products are widespread and include lapilli tuff, lithic tuff, agglomerate and pyroclastic breccia; compositionally similar lava flows are massive or blocky.
They are > 100 m deep, and are filled with allogenic breccia.
The fault planes are characterized by anastomosing clayey gouge layers with thin (1 mm-10 cm) zones of cataclasite, breccia and hematite-clay-coated fractured rock.
These breccias are angular and very poorly sorted, indicating an explosive hydraulic origin.
The breccia zones do not contain mineral phases that can be dated by isotopic methods.
The breccia contains a variety of boulders, dominated by vesicular basalt and phonolitic lavas.
The breccias were deposited within fluvial channels and by unconfined sheetfloods.
The zone of deformation bands shows incipient breccia formation with centimetre-sized angular fragments of sediment having been preserved between the bands.
The presence of interlayered tuffaceous sediments, conglomerates and carbonate breccias, coupled with the local existence of pillowed lavas, are suggestive of a marine environment.
A huge range of lithologies is described and their formation explained: peperite, breccia, agglomerate, ignimbrite, to name but four.
The sedimentary breccias were probably formed from talus and/or other types of colluvium that were shed from the ring-fracture fault scarp of the caldera.

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