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asscciation for mexican cave studies box 7672 ut station austin ...

asscciation for mexican cave studies box 7672 ut station austin ...

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28FEATURENOTESUnderlying passageOverlying passageIf more than two passagesare suoerimposed, the planof the third (etc) passageshould be offset <strong>for</strong> clarity.LAbrupt drop with distance(down in hatcheddirectionIce-eJ-Unsurveyed passageCross-sectionLimit of penetrationof daylightSame indication should ~~given as to whether or notthe passage ends.Direction of view shown byarrow. Al~ x-sections shouldbe drawn horizontally.Under the most favourableconditions.Drop in ceiling height(down in hatched dir n .)Distance must be in sameunits as specified on map.R=ropeHL=handlineL=ladderApplied to perennial iceonly.Pool with depthStreamThis is used to indicateboth standing water anda pool in a streamway.~ = pool >6 ft deep.Siphon(or sump)Under "normal" conditions.Large breakdownSmall breakdown

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