. Frost & fire : natural engines, tool-marks & chips : with sketches taken at home and abroad by a traveller. d, fractured rocks into roches moutonnees, and mountain-glens into rounded, polished, striated rock-grooves, whosegeneral section is a curve ?>—^. \Vheu the ice melts floatingcliips are left in the groove, in their order. This is at best a veiy imperfect description of a glacier ;tlie science of the matter will be foimd elsewhere, in workswritten by men who have made the subject their specialstudy. Tliese differ on some points of detail, but all agree thatglaciers move and mark rock
. Frost & fire : natural engines, tool-marks & chips : with sketches taken at home and abroad by a traveller. d, fractured rocks into roches moutonnees, and mountain-glens into rounded, polished, striated rock-grooves, whosegeneral section is a curve ?>—^. \Vheu the ice melts floatingcliips are left in the groove, in their order. This is at best a veiy imperfect description of a glacier ;tlie science of the matter will be foimd elsewhere, in workswritten by men who have made the subject their specialstudy. Tliese differ on some points of detail, but all agree thatglaciers move and mark rocks. The lesson learned from these Norwegian glaciers is thata local land-ice system consists of a number of revolvingwater-systems, which rise np from warm regi(jns, uKjve in theair, fall on cold solid rock, slide and flow from it; carvinghollows on hill-sides, and leaving tracks everywhere on thedownward path, which leads water luxck to the sea from ablock of high lanl 204 DKNUDATION—FROST-MARKi=. The river-glacier is part of tlie system ; it is a graviuitool; and it does notal)lo work near Till Am/,(;/,/f,iw, fl/ifs iiinrAsniitic/ii/s Sno-i i/(Vi i —~I at ^( rock-groove U ///^ ///(;< In d I Id Is oi. Fi(!. :iO. Kaai THK (IHH. Sp],!,. .1, CHAPTER XVr. DENUDATION 8 — FROST-MAllKS G—LAND-ICE 5—LOCAL SYSTEM—SOUTHERN NORWAY 3. From the movements of land-ice it is easy to learn the directionof tool-marks wliich result from the movement. In Justedal, as elsewhere, marks are conspicuous underand near the ice. Rocks are rounded, smoothed, and grooved;and because the grooves are the tracks and ruts of the ice-sledge, they all lead various ways back to the the source of the glacier—from the highest point; fromKaabe—lines nmst radiate to the sea, through every glenwhich holds part of the drainage of the ice-field. The markof the local land-ice system is a star * or some other radiat-ing figure ; or a herrmg-bone pattern, on a ridge. Wliere iceh
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