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conglomerate

conglomerate

SRI Petrography ID: 60

Gollinger
Salzburg

Names

[de] Konglomerat
[en] conglomerate

Description

sedimentary rock, composed of rounded, mostly water born, gravel-size pebbles in a finer sediment matrix. Conglomerate is the consolidated equivalent of gravel.
The size of the fragments refers to a mean particle diameter above 2 mm (more than 50% of the particles have to be larger than 2 mm), below this grain size: sandstone.
conglomerates are composed of rounded fragments (contrary to breccias).
Conglomerates can be subdivided according to their average grain size into granule conglomerate (clast size 2-4 mm) pebble conglomerate (clast size 4-64 mm), cobble conglomerate (clast size 64-256 mm) and boulder conglomerate (clast size above 256 mm)
Conglomerates can be found in different sedimentary environments: fluvial, alluvial, glacial, marine (deepwater (turbidites), shallow marine), talus (slopes)

Color

matrix usually grey, brown or yellow, clasts variable (depending on material)

Grain Size

Matrix mostly fine grained (< 2 mm), components 2-256 mm

Texture

typical conglomerate texture, often banked

Minerals

matrix: carbonatic, mostly calcitic, containing feldspar, quartz, mica,…
clasts variable

Occurences

various sites

Classification

Class

SEDIMENTARY ROCKS

Broader Terms

clastic sedimentary rocks

Narrower Terms

Austria-conglomerate

England-conglomerate

France-conglomerate

Germany-conglomerate

Slovenia-conglomerate