EARTH SCIENCE LAB
Sedimentary Sample #6:

Identify the Texture, Grain Size, Composition and Rock Type

Image of Sedimentary Sample #6
Click here for a close up image

     

Sedimentary Rock Identification Chart
TEXTURE GRAIN SIZE COMPOSITION ROCK NAME
Clastic >2 mm rounded quartz, feldspar and rock fragments Conglomerate
>2 mm angular quartz, feldspar and rock fragments Breccia
1/16 - 2 mm quartz, feldspar Sandstone
>1/16 mm feldspar, quartz Arkose
<1/16 mm quartz, clay minerals Siltstone
     (Mudstone, Shale)
<1/256 mm quartz, clay minerals Claystone
Chemical no grain size silica (quartz) Chert
dolomite Dolostone
calcite Limestone
halite Rock Salt
gypsum Rock Gypsum
Biologic no grain size silica (quartz) Chert
loosely compacted organic material
     and plant fragments		 Peat
densely compacted organic material
     and plant fragments		 Bituminous Coal
calcite Limestone
calcite, micro-skeletal fragments Chalk
calcite, almost entirely shell
     and skeletal fragments		 Coquina
calcite with some shell
     and skeletal fragments		 Fossiliferous Limestone
dolomite with some shell
     and skeletal fragments		 Fossiliferous Dolostone

Select a Sample to Identify:

1 •2 •3 •4 •5 •6 •7 •8 •9 •10 •11 •12
•

Return to Introduction

Link to Richard Harwood's courses web site
____
Link to Black Hawk College web site
Notice: The material contained within these web pages only applies to those courses and sections taught by Richard Harwood. Unless otherwise noted, all images and graphics contained within are the property of Richard Harwood and may only be reproduced with permission from the author.