Introductory Geology - Clastic Rock Textures

 

 

 

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These photographs are of clastic rocks, which are composed of pieces (clasts) of other rocks or minerals; an example is a sandstone composed of sand-sized grains of the mineral quartz. 

Click on a small photo to the left to bring up a larger version.

hopi_buttes.jpg (179487 bytes) Coarse-grained clastic rock with mostly rounded clasts (conglomerate), Hopi Buttes, Arizona
barnes_cong.jpg (96508 bytes) Coarse-grained clastic rock with well-rounded clasts (conglomerate), Salt River Canyon, Arizona
hiero_megabreccia.jpg (202833 bytes) Coarse-grained clastic rock with angular clasts (breccia), Lake Pleasant, Arizona
hiero_tuff_seds.jpg (37762 bytes) Coarse-grained clastic rock with angular clasts (breccia), Lake Pleasant, Arizona
harq_cong.jpg (35429 bytes) Coarse-grained clastic rock with angular clasts (breccia), Little Harquahala Mountains, Arizona
galiero.jpg (41780 bytes) Medium- to coarse-grained clastic rock overlying fine-grained (sandy) clastic rock, Galiuro Mountains, Arizona (both rocks and the unconformity between them  have been tilted)