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13—Glacial and Glaciofluvial Features

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13—Glacial and Glaciofluvial Features Federal Geographic Data Committee FGDC Document Number FGDC-STD-013-2006 FGDC Digital Cartographic Standard for Geologic Map Symbolization Appendix A 13—GLACIAL AND GLACIOFLUVIAL FEATURES REF NO DESCRIPTION SYMBOL CARTOGRAPHIC SPECIFICATIONS* NOTES ON USAGE* lineweights .2 mm 13.1 Crevasse on glacier color 100% cyan lengths may vary lineweight .25 mm length may vary 13.2 Ice-flow direction color 100% cyan 60° 1.5 mm color 1.25 Glacial-lake spillway—Arrow shows direction of flow 100% mm length 13.3 cyan 25° may vary lineweight .2 mm 60° 2.0 mm HI-6 (100% black) Glacial-lake spillway—Showing elevation. Arrow 785' 785' 13.4 shows direction of flow Inferred glacial-lake spillway—Arrow shows direc- 13.5 tion of flow all lineweights .2 mm Inferred glacial-lake spillway—Showing estimated 785' 785' 13.6 elevation. Arrow shows direction of flow all 7.5 mm 20° Glacial meltwater stream—Barbs show direction of lineweights spacing 13.7 flow .2 mm may vary color 100% cyan 3.0 mm 2.25 mm spacing all lineweights .25 mm Cutbanks of glacial meltwater stream channel may vary 13.8 color (mapped to scale)—Hachures point into channel 1.125 mm 100% cyan 3.0 mm color stem lengths may vary Flow direction of glacial meltwater in stream chan- 100% cyan 13.9 nel all lineweights .2 mm 25° 2.0 mm color 100% cyan lineweight .2 mm Crest line of moraine, sense of symmetry unspeci- 13.10 fied (1st option) circle diameter .75 mm; spacing .625 mm color 100% cyan Crest line of moraine, sense of symmetry unspeci- 13.11 fied (2nd option) dot diameter .825 mm; spacing .625 mm 3.0 mm .5 mm color all lineweights 13.12 Crest line of symmetrical moraine 100% cyan .2 mm circle diameter .675 mm; hachure height 1.5 mm Crest line of asymmetrical moraine—Ticks point 13.13 down steeper slope hachure height .75 mm color 100% cyan lineweight .25 mm 13.14 Ridges on moraine lengths and spacing may vary Scarp at top of ice-contact slope—Hachures point .5 mm 13.15 1.375 downscarp mm color 100% cyan 12° 13.16 Ice-contact slope pattern 521-C in 50% cyan 1.25 mm .375 mm .625 mm Esker or ice-channel deposit, transport direction 13.17 unknown 70° color 100% cyan lineweight .2 mm Esker or ice-channel deposit, transport direction color 1.25 mm 13.18 known (1st option)—Chevrons point in direction of 100% 70° cyan lineweight transport 1.0 mm .2 mm Esker or ice-channel deposit, transport direction color 5.0 1.25 mm 100% mm 13.19 known (2nd option)—Chevrons point in direction cyan 70° of transport lineweight .375 mm lineweight .2 mm 2.25 mm 1.25 mm color Point of observation is 13.20 Drumlin—Showing bearing and direction of flow all 1.25 25° 100% at the midpoint of the lineweights mm 1.875 mm cyan .2 mm 6.0 mm bearing line. May also be shown in Drumlin, flow direction unknown (1st option)— 1.875 mm 13.21 black or other colors. Showing bearing 6.0 mm 1.75 mm lineweight Drumlin, flow direction unknown (2nd option)— 13.22 1.0 mm .2 mm Showing bearing color 100% cyan 3.5 mm color 100% cyan 1.25 mm Use when map scale is Drumlin (length mapped to scale)—Showing bear- 13.23 1.25 mm 25° large enough to show ing and direction of flow draw length to scale all lineweights .2 mm actual length of drumlin. May also be shown in Drumlin (length mapped to scale), flow direction 13.24 black or other colors. unknown—Showing bearing draw length to scale *For more information, see general guidelines on pages A-i to A-v. A–13–1 Federal Geographic Data Committee FGDC Document Number FGDC-STD-013-2006 FGDC Digital Cartographic Standard for Geologic Map Symbolization Appendix A 13—GLACIAL AND GLACIOFLUVIAL FEATURES (continued) REF NO DESCRIPTION SYMBOL CARTOGRAPHIC SPECIFICATIONS* NOTES ON USAGE* color 100% cyan all lineweights May also be shown in 45° 13.25 Kettle 3.0 mm .2 mm black or other colors. 1.75 mm pattern 523-K in 50% black 13.26 Hummocky topography (1st option) pattern 523-DO in 50% black 13.27 Hummocky topography (2nd option) 13.28 Hummocky topography (3rd option) pattern 524-K in 50% black lineweight .2 mm 6.0 Point of observation is Younger glacial striation or groove—Showing gen- mm 25 13.29 ° at the midpoint of the eral bearing and direction of flow color 100% cyan 1.25 mm bearing line. Younger glacial striation or groove—Showing meas- 2.625 mm May also be shown in 13.30 ured bearing and direction of flow. Dot indicates black or other colors. location of observation point dot diameter .75 mm 2.625 mm Older glacial striation or groove—Showing general 13.31 bearing and direction of flow all lineweights .2 mm .75 mm Older glacial striation or groove—Showing meas- 2.625 mm 13.32 ured bearing and direction of flow. Open circle all lineweights indicates location of observation point .2 mm circle diameter .75 mm lineweight .2 mm color 100% cyan Younger glacial striation or groove, flow direction 13.33 unknown—Showing general bearing 6.0 mm Younger glacial striation or groove, flow direction 2.625 mm 13.34 unknown—Showing measured bearing. Dot indi- cates location of observation point dot diameter .75 mm 2.625 mm Older glacial striation or groove, flow direction 13.35 unknown—Showing general bearing all lineweights .2 mm .75 mm Older glacial striation or groove, flow direction 2.625 mm 13.36 unknown—Showing measured bearing. Open cir- all lineweights cle indicates location of observation point .2 mm circle diameter .75 mm length may vary Use when map scale is Younger glacial striation or groove (length mapped lineweight .2 mm 13.37 25° large enough to show to scale)—Arrow shows direction of flow color 100% cyan 1.5 mm actual length of striation length may vary or groove. Younger glacial striation or groove (length mapped 13.38 May also be shown in to scale), flow direction unknown black or other colors. lineweight .2 mm 2.125 mm Older glacial striation or groove (length mapped to color 100% 13.39 scale)—Arrow shows direction of flow cyan length may vary .75 mm Older glacial striation or groove (length mapped to 13.40 scale), flow direction unknown length may vary color 100% cyan lineweight May also be shown in lineweight .3 mm 13.41 Cirque headwall—Hachures point into cirque .2 mm black or other colors. hachure height 1.0 mm; spacing 1.0 mm color 100% cyan lineweight lineweight .3 mm 13.42 Arête or headwall of adjoining cirques .2 mm hachure height 2.0 mm; spacing 1.0 mm Margin of glacially scoured basin—Identity and all lineweights color 100% cyan 13.43 .225 mm existence certain, location accurate. Hachures H-8 point into basin ? 1.0 Margin of glacially scoured basin—Identity or exis- mm 13.44 tence questionable, location accurate. Hachures .75 ? mm point into basin 12.0 mm 2.0 mm Margin of glacially scoured basin—Identity and 2.0 mm 13.45 existence certain, location approximate. Hachures 3.5 mm point into basin ? Margin of glacially scoured basin—Identity or exis- 13.46 tence questionable, location approximate. Hach- ? .75 mm .75 mm ures point into basin Margin of glacially scoured basin—Identity and 13.47 existence certain, location concealed. Hachures 1.25 mm point into basin ? Margin of glacially scoured basin—Identity or exis- 13.48 tence questionable, location concealed. Hachures ? .75 mm .75 mm point into basin *For more information, see general guidelines on pages A-i to A-v. A–13–2 Federal Geographic Data Committee FGDC Document Number FGDC-STD-013-2006 FGDC Digital Cartographic Standard for Geologic Map Symbolization Appendix A 13—GLACIAL AND GLACIOFLUVIAL FEATURES (continued) REF NO DESCRIPTION SYMBOL CARTOGRAPHIC SPECIFICATIONS* NOTES ON USAGE* lineweight .45 mm color 100% cyan May also be shown in Glacial limit or terminus—Identity and existence 13.49 black or other colors. certain, location accurate H-8 ? Glacial limit or terminus—Identity or existence 13.50 ? .75 mm questionable, location accurate 12.0 mm Glacial limit or terminus—Identity and existence 13.51 3.5 mm certain, location approximate ? Glacial limit or terminus—Identity or existence 13.52 questionable, location approximate ? .75 mm .75 mm Glacial limit or terminus—Identity and existence 1.5 mm 13.53 certain, location inferred ? Glacial limit or terminus—Identity or existence 13.54 questionable, location inferred ? .75 mm .75 mm Glacial limit or terminus—Identity and existence 13.55 .5 mm certain, location concealed ? Glacial limit or terminus—Identity or existence 13.56 questionable, location concealed ? .75 mm .75 mm H-8 (100% black) Glacial limit or terminus—Showing name of glacia- BL BL 13.57 tion (BL, Bull Lake) Limit of significant glacial advance—Identity and ex- lineweight .3 mm color 100% cyan 13.58 istence certain, location accurate. Hachures on 7.5 mm H-8 side of advancing ice hachure ? ? lineweight Limit of significant glacial advance—Identity or exis- .25 mm 13.59 tence questionable, location accurate. Hachures ? ? .75 mm on side of advancing ice hachure height 1.25 mm; spacing 4.0 mm Limit of significant glacial advance—Identity and ex- 13.60 istence certain, location approximate. Hachures 3.5 mm on side of advancing ice ? ? Limit of significant glacial advance—Identity or exis- 13.61 tence questionable, location approximate.
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