. Clarke County, Ga. and the city of Athens. ne, glis-tening plates or scales. These are fre-quently noticeable in the dust by theroadside or in the beds and along thesides of small streams. Quartz simplyforms sand ; it cannot be further decom- 2k CLARKE COUNTY, GEOBGIA, posed. The feldspar and mica (and othersimilar minerals) are, however, not onlycrumbled into fine particles but are act-tually decomposed. Thus, feldspar,which is composed chiefly of silica(silicic acid), alumina and potash, withsmall quantities of lime, soda, iron andother ingredients, decomposes under theaction of weathering
. Clarke County, Ga. and the city of Athens. ne, glis-tening plates or scales. These are fre-quently noticeable in the dust by theroadside or in the beds and along thesides of small streams. Quartz simplyforms sand ; it cannot be further decom- 2k CLARKE COUNTY, GEOBGIA, posed. The feldspar and mica (and othersimilar minerals) are, however, not onlycrumbled into fine particles but are act-tually decomposed. Thus, feldspar,which is composed chiefly of silica(silicic acid), alumina and potash, withsmall quantities of lime, soda, iron andother ingredients, decomposes under theaction of weathering and produces sand(silica), clay (silicate of alumina and Clarke county is, therefore, essentially aclay soil. As the quantity of iron in thefeldspar, etc., is considerable, the oxideof iron formed during weathering givesthe soil generally a decided red sorting action of rain water modi-fies to some extent the natural characterof the soil in many places. Clay islighter and finer than sand and is,therefore, more easily washed The Georgia Normal School. water) and silicate of potash principally,with small quantities of oxide of iron,lime and soda compounds, etc. Mica,which has a somewhat similar composi-tion, produces, on weathering, similarresults. The principal ingredients ofthe soil formed by the weathering of agneissoid granite are, therefore, sandand clay ; and as the quantity of clay islarge, such soils are usually clay may be called the natural soil of The larger streams of the county aretherefore almost constantly more or lessmuddy from the quantity of fine claywhich they carry, and the smallerstreams are frequently so. This exces-sive washing away of the clay as com-pared with the sand results in the pro-duction of sandy soil. This is especiallythe case upon the tops and sides of thesteeper hills and in bottoms where thevelocity of a swiftly running stream is AND THE CITY OF AT?IENS. ^5 first checked. With the clay there is sents the soil to a
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