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Southern Blue Ridge: An Analysis of Matrix Forests - Conservation ...

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Appendix C: <strong>Southern</strong> <strong>Blue</strong> <strong>Ridge</strong> Geology ClassesGeology class Lithotypes Metaequivalents100: ACIDICMudstone,(Low grade:)SEDIMENTARY /claystone, siltstone, slates, phyllites,METASEDIMENTARY: fine- non-fissile shale, pelites; (Modto coarse-grained, acidic sandstone,grade:) schists,sed/metased rock conglomerate, pelitic schists,breccia, greywacke, gran<strong>of</strong>elsarenites200: ACIDIC SHALE: Finegrainedacidic sedimentaryFissile shalesrock with fissile textureCommentsLow to moderatelyresistant rocks typical <strong>of</strong>valleys and lowlands withsubdued topography; puresandstone and metasedimentsare moreresistant and may form lowto moderate hills or ridgesLow resistance; producesunstable slopes <strong>of</strong> fine talus300: CALCAREOUSSEDIMENTARY / META-SEDIMENTARY:basic/alkaline, s<strong>of</strong>tsed/metased rock withhigh calcium content400: MODERATELYCALCAREOUSSEDIMENTARY /METASED: Neutral tobasic, moderately s<strong>of</strong>tsed/metased rock withsome calcium but less sothan aboveLimestone, dolomite,dolostone, othercarbonate-richclastic rocksCalc shales, calcpelites andsiltstones, calcsandstonesMarbleLightly to mod.metamorphosedcalc pelites andquartzites, calcschists andphyllites, calcsilicategran<strong>of</strong>elsLowlands and depressions,stream/river channels,ponds/lakes, groundwaterdischarge areas; soils arethin alkaline clays, highcalcium, low potassium;rock is very susceptible tochemical weathering; <strong>of</strong>tenunderlies prime agriculturalareasVariable group dependingon lithology but generallysusceptible to chemicalweathering; s<strong>of</strong>t shales<strong>of</strong>ten underlie agriculturalareas36

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