_REVISION - M1977347 ‎(2)‎

• Permit No: M1977347
• IBM Index Class Name: Revision
• Doc Name: GEOTECHNICAL ENGINEERING REPORT
• Type & Sequence: AM1
• Media Type: D
• Archive: No

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ROCK CLASSIFICATION
(Based on ASTM C-294)
Sedimentary Rocks
Sedimentary rocks are stratified materials laid down by water or wind. The sediments may be
composed of particles of pre-existing rocks derived by mechanical weathering, evaporation or by
chemical or organic origin. The sediments are usually indurated by cementation cr compaction.
Chert Very fine-grained siliceous rock composed of micro-crystalline or crypto-
crystalline quartz, chalcedony or opal. Chert is various colored, porous to
dense, hard and has a conchoidal to splintery fracture.
Claystone Fine-grained rock composed of or derived by erosion of silts and clays or any
rock containing clay. Soft massive; gray, black, brown, reddi ah or green and
may contain carbonate minerals.
Conglomerate Rock consisting of a considerable amount of rounded gravel, send and cobbles
with or without interstitial or cementing material. The cementing or interstitial
material may be quartz, opal, calcite, dolomite, clay, iron oxides or other
materials.
Dolomite Afine-grained carbonate rock consisting of the mineral dolomite [CaMg
(CO,)z). May contain noncarbonate impurities such as quartz, Chert, clay
minerals, organic matter, gypsum and sulfides. Reacts with hydrochloric acid
(HCLI.
Limestone Afine-grained carbonate rock consisting of the mineral calcite ICaCo31• May
Contain noncarbonate impurities such as quartz, Chert, clay minerals, organic
matter, gypsum and sulfides. Reacts with hydrochloric acid IHCLI.
Sandstone Rock consisting of particles of sand with or without interstitial and cementing
materials. The cementing or interstitial material may be quartz, opal, calcite,
dolomite, clay, iron oxides or other material.
Shale Fine-grained rock composed of, or derived by erosion of silts and clays or any
rock containing clay. Shale is hard, platy, or fissile may be gray, black,
reddish or green and may contain some carbonate minerals (calc:areous shale).
Siltstone Fine grained rock composed of, or derived by erosion of silts or rock
containing silt. Siltstones consist predominantly of silt sized particles (0.0625
to 0.002 mm in diameter) and are intermediate rocks between c:laystones and
sandstones, may be gray, black, brown, reddish or green anti may contain
carbonate minerals.
Empire LaboratoriE~s, Inc.
A Division of The Terracon Comr~anies, Inc.