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Geological Map of James Ross Island

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Geological Map of James Ross Island 58°30'W 58°00' 57°30' 57°00'W Ė Ė 500 500 100 200 500 Cape Lachman 200 OUTCROP MAP Cape LONG 11 12 2.03 ± 0.04(2) 28 30 fs Well-met ISLAND 34 Vertigo Clif 1:125 000 Scale 3 P [1.27 ± 0.08(1)] Gregor Mendel 5.16 ± 0.83(5) 29 L L F Keltie Head L DEVIL ISLAND Station (Czech) 5.67 ± 0.03(6) 7 F 28 29 7 [recalculated 27 A 3 ? weighted mean L 7 L 4 LINE OF CROSS SECTION age] L Bibby 2 ? 0.99 ± 0.05(2) F 2.67 ± 0.13(2) 12 5 3 29 Point 20 14 F 28 L 29 L 4 L Geological Map of James Ross Island 30 8 L 15 5 18 ? L L 12 5.23 ± 0.57(1) 26 L 15 L L 7 3 5.32 ± 0.16(2) Berry Hill 8 L 11 30 38 15 15 L 1 ? 25 L 3 L 10 Johnson L 4 500 L 11 L 26 Sandwich 1. James Ross Island Volcanic Group San Carlos Mesa L Pirrie Col 30 Bengtson Clif 500 Point L 1 Bluff L L Cape Gordon 25 L 5.04 ± 0.04(2) 5.42 ± 0.08(2) L L Brandy Bay 7 ? L L 8 29 F 4.63 ± 0.57(1) 27 L 7 4 8 VEGA ISLAND 4.6 ± 0.4(4) 27 15 L 12 fs L 500 L BAS GEOMAP 2 Series, Sheet 5, Edition 1 F 3 L 27 29 Feb. 2000 11 6.13 ± 0.56(1) 6 4 7 L 3 20 ? 7 L 4 4 500 Stoneley 35 L L 8 4.71 ± 0.06(2) Geological interpretations, cross section, geochronology and data preparation by J.L. Smellie. Digital cartography by J.L. Smellie Point 32 35 6 CARLSON L [not in situ] 34 Abernethy Flats 38 30 32 500 30 22 4.74 ± 0.03(2) L L and A.E. Nelson. Design and layout by J.L. Smellie and T.R. Riley. Digital Elevation Model by M. Biszczuk. Geological mapping Whisky Bay ? L Mahogany ISLAND L 14 28 17 L and digital map production were undertaken as part of three British Antarctic Survey Programmes: Global Interactions of the L 34 4 Leal 29 29 Bluff 25 ? 29 ? Hambrey30 30 L L Antarctic Ice Sheet (GIANTS), Greenhouse to Ice-House Evolution of the Antarctic Cryosphere & Palaeoenvironment (GEACEP) 2.0 ± 0.5(4) Clif 32 26 27 Bluff L 32 L 1 L 1.4 ± 0.3(4) 12 12 ? L 5.08 ± 0.04(2) 16 7 and Environmental Change and Evolution (ECE). 1.4 ± 0.2(4) 3 Rink Point 20 ? L L 27 7 L ? ? L 11 fs 500 4 L TRINITY ? 20 3 Davies L 20 Lachman Crags Base map for geological field mapping was British Antarctic Survey (1995; James Ross Island. BAS 100 Series (topographic 7 4.78 ± 0.07(2) L L ? Dome 1 4 L 20 6 4 maps), Sheet 2, 1: 100 000. Cambridge, British Antarctic Survey) and air photographs (BAS/JR/1/79). Base map data for PENINSULA F 16 L 27 Pastorizo 7 L 12 15 4 20 bathymetry, coastlines and ice shelves are from British Antarctic Survey (2010; Northern Antarctic Peninsula, 1:250 000 scale, L? Bay 11 3.95 ± 0.05(2) 50 3 4 2.07 ± 0.06(2) 0 20 BAS (UKAHT) Sheets 3A and 3B, Edition 1, Cambridge, British Antarctic Survey). 12 5.64 ± 0.25(2) 29 T SOUND 29 28 San Jose Pass [not in situ] P St Martha 12 ? Andreassen km 20 Kipling Preferred reference for map: Lagrelius Point P Slopes P L Point 2.09 ± 0.11(2) HERBER ? 8 P Mesa 3.05 ± 0.70(5) SMELLIE, J.L., JOHNSON J.S. & NELSON, A.E. 2013. Geological map of James Ross Island. I. James Ross Island Volcanic V CHANNEL L Cape Lamb JAMES ROSS ISLAND VOLCANIC GROUP P [not in situ] [Late Miocene-Recent] A 5.36 ± 0.05(2) Whisky Glacier The Naze6 1 Group (1:125 000 scale). BAS GEOMAP 2 Series, Sheet 5, British Antarctic Survey, Cambridge, UK. 8 5.91 ± 0.08(2) 1 Akela Col1 4 Smellie Peak P St Martha P 32 GUSTAV GROUP MARAMBIO GROUP SEYMOUR ISLAND GROUP 6 6 5.14 ± 0.38(2) 34 14 Cove 1 7 Projection: Lambert Conformal Conic; Spheroid: WGS 84; Standard parallels at 60°40'S and 63°20'S; Latitude of origin: 60°20'S. P False Island [Barremian-Coniacian] [Santonian-Palaeocene] [Palaeocene-Eocene(-Oligocene)] 7 3 5 8 L L P P 30 6.16 ± 0.08(2) L L 5 40 Point 1 5.87 ± 0.04(2) 34 P P 20 15 5.90 ± 0.17(2) L 9 L Published by BRITISH ANTARCTIC SURVEY, High Cross, Madingley Road, Cambridge, CB3 0ET, United Kingdom. This 4.6 ± 0.4(4) 4.44 ± 0.25(1) 3.57 ± 0.34(1) 32 4 1 6 L geological map is copyright © British Antarctic Survey, Natural Environment Research Council, 2013. All rights reserved. L [4.35 ± 0.39(2)] 32 L 5.89 ± 0.09(2) Virgin Hill 26 34 ? 8 20 10 8 [2.1 ± 1.0(4)] 12 22 25 L Lookalike Peaks 5.68 ± 0.31(1) [3.68 ± 0.82(1)] 25 P P 14 L 26 P 1 10 16 7 DIGITAL ELEVATION MODEL Seacatch Nunataks ? PRINCE GUST San Fernando Hill 7 7 10 38 9 fs 5 8 3 4 30 30 32 4 7 1 0.66 ± 0.22(2) Carro Pass 5.36+-0.28(2) 15 Matkah Point 5 10 Dinn Clif 10 16 ? Stickle Ridge ? 22 Terrapin GEOLOGICAL LEGEND 7 5 22 18 12 ? 5.84 ± 0.34(2) Hill 22 16 12 28 HUMPS 42 Shrove Cove [1.94 ± 0.47(2)] Holluschicki Bay 1 F 7 10 SUB-REGION BOUNDAR Blancmange 10 ISLAND This map depicts the solid geology, i.e. with Holocene regolith removed. The representation of geological units does not imply that Massey Heights 5.47 ± 0.11(2) 20 8 6 4 24 6 Hill 25 6 6 25 8 solid rock crops out everywhere at the surface. Kotick Point Organpipe 4 4 F 4 3.1 ± 0.8(5) 2.03 ± 0.13(2) F 3 1 fs Feb. 2000 Nunatak 5.82 ± 0.56(2) F 18 8 16 30 30 4 Dreadnought Taylor 20 8 8 5 28 30 28 L F Y 500 Limmershin Clif 4.36 ± 0.21(1) L L 13 22 Point 3 20 30 5.65 ± 0.51(2) Bluff Forster Cliffs L 1 f P L 38 7 1 26 28 12 24 20 L ? 1. VOLCANIC ROCKS 3 10 3 1 F L 4 2.82 ± 0.66(2) 20 8 30 64°00'S L 5.33 ± 0.47(2) 18 5.85 ± 64°00' L ULU PENINSULA ? 500 L 7 3 0.03(2) 200 13 18 8 32 24 4.7 ± 1.1(2) 26 Sykes Cliffs 20 2.50 ± 0.07(2) LAVA-FED DELTAS L 4.53 ± 0.08(2) 10 L [3.5 ± 0.5(4)] 4 20 1.15 ± 0.12(2) L 4.64 ± 0.09(2) L 4 ? Patalamon 1 Donnachie10 Clif 2.38 ± 0.41(2) L 7 Basaltic volcanic units resembling sedimentary deltas but formed of subaerial pahoehoe capping lavas (”topset beds”) overlying L 1.53 ± 0.18(1) ? ? L Mesa 5 13 -0.26 ± 0.34(2) F ? 20 32 20 subaqueously deposited steeply-dipping foreset beds of hyaloclastite breccia. Each delta was formed during a single voluminous 24 L 6.02 ± 0.12(2) L 30 ? 5.37 ± 0.37(2) L L eruption, mainly from vent(s) at Mount Haddington but also from several outlying flank and satellite centres (e.g. Dobson Dome, L 16 L 20 22 Dobson Dome L ? L L 25 islands in Prince Gustav Channel). Eruptions were mainly subglacial. Divided into three sub-regions to aid depiction. No lava-fed 1 L 4.68 ± 0.20(1) L 22 Stark ? 36 F 5.17 ± 0.05(2) 500 deltas are known to occur in more than one sub-region. The delta formations are arranged chronologically for each sub-region. 40 Back Mesa P 16 [not in situ] Blyth Point 1 7 38 L P 16 500 19 Skep Point 28 13 L 1 Spur 4 8 3 26 L 24 4 4 26 ULU PENINSULA VEGA ISLAND Gin Cove Sentinel Buttress 8 1 7 ? ? FOUR-TIMES VERTICAL 4 Croft 24 5.01+-0.12(2) 8 EXAGGERATION 5.36 ± 0.51(1) 5 13 19 Dobson Dome Formation 30 Keltie Head Formation Ineson Glacier L 22 5.4 ± 0.3(4) 1 26 L 6 Bay 6.5 ± 0.3(4) 20 5.45 ± 0.32(1) 18 Donnachie Cliffs Formation 29 Cape Well-met Formation 5.01 ± 1.62(5) 500 24 8 5.26 ± 0.10(2) ? 1 6 4 ? 7 L 8 17 28 Vertigo Cliffs Formation Tumbledown 1 L ? Lachman Crags Formation 1 Ula Point ? L Mesa L ? 16 Palisade Nunatak L 24 7 500 16 27 8 15 Patalamon Mesa Formation Sandwich Bluff Formation L L L L L 13 L 13 L 3 L L L 15 7 2.68+-0.04(2) 8 Johnson Mesa Formation 3 Flett L 3.13 ± 0.76(5) EASTERN & SOUTHERN L L L 1 16 L 8 L Lonely 3.94 ± 0.85(3) Buttress 7 4.69 ± 0.25(2) 1000 8 14 Smellie Peak Formation JAMES ROSS ISLAND L Rock Rum Cove Crisscross L 8 6 13 26 L Tumbledown Formation Jefford Point Formation L Crags 5.15+-0.33(1) 13 12 Kipling Mesa Formation 25 Sungold Hill Formation 25 8 L L L 8 13 5.37 ± 0.35(1) L Flatcap Point 13 11 24 1 8 Cape Lachman Formation Forster Cliffs Formation 1 Multiple uncorrelated lava-fed 1 deltas in cliffs Molley Corner Coley Glacier 10 23 Jonkers Mesa Formation 8 Stickle Ridge Formation 2.23 ± 0.05(2) 9 22 Ekelof Point Formation Cape Obelisk 8 Eugenie Spur Lookalike Peaks Formation 500 7 Cape Gage 21 Hamilton Formation Feb.
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