1
Southern Appalachians
LAURENTIAN REALM (entire orogen)
Grenville basement of Laurentia including ca. 1 Ga inliers within the hinterland
Gneiss, schist, and plutonic rocks affected by the Grenville Orogeny and
associated post-orogenic granitoid bodies. Elk Park Plutonic Suite, Mount Holly
Complex, Disappointment Hill Complex
12a
AXIAL REALM
Northern Appalachians
Peri-Laurentian Arc System (Iapetan)
Mainly Cambrian (>495 Ma) ophiolitic and suprasubduction-zone magmatic rocks
with associated sedimentary rocks, broken formation and mélange. Characterized
by Laurentian fauna. Belvidere Mountain and Mt. Orford complexes; Lushs Bight
Group
12a_INT_FELSIC
by Laurentian fauna. Intrusive rocks (felsic). Belvidere Mountain and Mt.
Orford complexes; Lushs Bight Group
12a_MAFIC_OPH
by Laurentian fauna. Mafic components of an ophiolite and areas of isolated
ultramafic and metaultramafic bodies. Belvidere Mountain and Mt. Orford
complexes; Lushs Bight Group
12a_UMAFIC_OPH
by Laurentian fauna. Ultramafic components of an ophiolite and areas of
isolated ultramafic and metaultramafic bodies. Belvidere Mountain and Mt.
12a_VOL_MAFIC
by Laurentian fauna. Volcanic rocks (mafic). Belvidere Mountain and Mt. Orford
12b
Mainly Lower to Upper Ordovician ophiolitic and magmatic-arc rocks with
associated sedimentary rocks; older strata contain Laurentian fauna. Hawley
Formation, Snooks Arm Group
12b_INT_FELSIC
associated sedimentary rocks; older strata contain Laurentian fauna. Intrusive
rocks (felsic). Hawley Formation, Snooks Arm Group
12b_INT_MAFIC
rocks (mafic). Hawley Formation, Snooks Arm Group
12b_MAFIC_OPH
associated sedimentary rocks; older strata contain Laurentian fauna. Mafic
components of an ophiolite and areas of isolated ultramafic and metaultramafic
bodies. Hawley Formation, Snooks Arm Group
12b_UMAFIC_OPH
associated sedimentary rocks; older strata contain Laurentian fauna. Ultramafic
12b_VOL_FELSIC
associated sedimentary rocks; older strata contain Laurentian fauna. Volcanic
12b_VOL_MAFIC
12c
Lower to Upper Ordovician forearc sedimentary rocks, in part deformed into
broken formation and mélange, largely deposited above 12b during its
translation onto the Laurentian margin. Saint-Daniel Mélange, Flat Water Pond
12c_INT_FELSIC
translation onto the Laurentian margin. Intrusive rocks (felsic). Saint-Daniel
Mélange, Flat Water Pond Group
12c_UMAFIC_OPH
translation onto the Laurentian margin. Ultramafic components of an ophiolite
and areas of isolated ultramafic and metaultramafic bodies. Saint-Daniel
12c_VOL_MAFIC
translation onto the Laurentian margin. Volcanic rocks (mafic). Saint-Daniel
12d
Upper Ordovician to Lower Silurian (445?434 Ma) magmatic-arc rocks. Locally
includes associated/interlayered sedimentary rocks. Attean pluton,
Pointe-aux-Trembles Formation, Burlington pluton
12d_INT_FELSIC
includes associated/interlayered sedimentary rocks. Intrusive rocks (felsic).
Attean pluton, Pointe-aux-Trembles Formation, Burlington pluton
12d_INT_MAFIC
includes associated/interlayered sedimentary rocks. Intrusive rocks (mafic).
13
Peri-Gondwanan Arc System (Iapetan)
Lower Paleozoic oceanic and volcanic-arc rocks commonly deposited on Ganderia.
13_INT_FELSIC
Intrusive rocks (felsic).
13_INT_MAFIC
Intrusive rocks (mafic).
13_MAFIC_OPH
Mafic components of an ophiolite and areas of isolated ultramafic and
metaultramafic bodies.
13_UMAFIC_OPH
Ultramafic components of an ophiolite and areas of isolated ultramafic and
13_VOL_FELSIC
Volcanic rocks (felsic).
13_VOL_MAFIC
Volcanic rocks (mafic).
13a
Cambrian to Lower Ordovician ophiolitic and suprasubduction-zone magmatic rocks
and associated sedimentary rocks, mélange, and broken formation. Characterized
by Celtic and/or Gondwanan faunas. Ellsworth Formation, Tally Pond Group
13a_INT_FELSIC
by Celtic and/or Gondwanan faunas. Intrusive rocks (felsic). Ellsworth
Formation, Tally Pond Group
13a_INT_MAFIC
by Celtic and/or Gondwanan faunas. Intrusive rocks (mafic). Ellsworth
13a_MAFIC_OPH
by Celtic and/or Gondwanan faunas. Mafic components of an ophiolite and areas
of isolated ultramafic and metaultramafic bodies. Ellsworth Formation, Tally
Pond Group
13a_UMAFIC_OPH
by Celtic and/or Gondwanan faunas. Ultramafic components of an ophiolite and
areas of isolated ultramafic and metaultramafic bodies. Ellsworth Formation,
Tally Pond Group
13a_VOL_FELSIC
by Celtic and/or Gondwanan faunas. Volcanic rocks (felsic). Ellsworth
13a_VOL_MAFIC
by Celtic and/or Gondwanan faunas. Volcanic rocks (mafic). Ellsworth Formation,
13b
Lower to Upper Ordovician ophiolitic, suprasubduction-zone, and rifted
volcanic-arc magmatic rocks with associated sedimentary rocks, mélange, and
broken formation. Older strata characterized by Celtic and/or peri-Gondwanan
faunas. Ammonoosuc Volcanics, Oliverian Plutonic Suite, Tetagouche Group,
Exploits Group
13b_INT_FELSIC
faunas. Intrusive rocks (felsic). Ammonoosuc Volcanics, Oliverian Plutonic
Suite, Tetagouche Group, Exploits Group
13b_INT_MAFIC
faunas. Intrusive rocks (mafic). Ammonoosuc Volcanics, Oliverian Plutonic
13b_MAFIC_OPH
faunas. Mafic components of an ophiolite and areas of isolated ultramafic and
metaultramafic bodies. Ammonoosuc Volcanics, Oliverian Plutonic Suite,
Tetagouche Group, Exploits Group
13b_ORTHOGNEISS
faunas. Orthogneiss. Ammonoosuc Volcanics, Oliverian Plutonic Suite, Tetagouche
Group, Exploits Group
13b_UMAFIC_OPH
faunas. Ultramafic components of an ophiolite and areas of isolated ultramafic
and metaultramafic bodies. Ammonoosuc Volcanics, Oliverian Plutonic Suite,
13b_VOL_FELSIC
faunas. Volcanic rocks (felsic). Ammonoosuc Volcanics, Oliverian Plutonic
13b_VOL_MAFIC
faunas. Volcanic rocks (mafic). Ammonoosuc Volcanics, Oliverian Plutonic Suite,
13c
Upper Cambrian to Upper Ordovician magmatic and sedimentary rocks of unknown
affinity. Marlboro Formation
13c_INT_MAFIC
affinity. Intrusive rocks (mafic). Marlboro Formation
13c_VOL_MAFIC
affinity. Volcanic rocks (mafic). Marlboro Formation
16a
PERI-GONDWANAN REALM
GANDERIA
Peri-Gondwanan basements
Migmatite, paragneiss, pelite, marble, platformal quartzite-carbonate
sequences, and olistostromal clastic rocks; >630 Ma. Blackstone Group, Westboro
Formation, Green Head Group, Blues Brook Formation, Islesboro Formation
16b
Orthogneiss; >700 Ma (confined to Avalonia). Economy River Gneiss
16c
Mafic magmatic rocks with associated clastic sedimentary rocks; ca. 760 Ma
(confined to Avalonia). Burin Group
16c_MAFIC_OPH
(confined to Avalonia). Mafic components of an ophiolite and areas of isolated
ultramafic and metaultramafic bodies. Burin Group
17
Magmatic arc
Mainly Upper Neoproterozoic to Lower Cambrian continental magmatic-
arc/back-arc rocks with associated clastic sedimentary rocks. Peak magmatism at
ca. 620 Ma and ca. 570 to 540 Ma. Includes locally minor Middle to Late
Cambrian magmatism. Dry Hill Gneiss, Massabesic Gneiss, Brookville Gneiss
17_INT_FELSIC
Cambrian magmatism. Intrusive rocks (felsic). Dry Hill Gneiss, Massabesic
Gneiss, Brookville Gneiss
17_INT_MAFIC
Cambrian magmatism. Paragneiss and metavolcanic rock. Dry Hill Gneiss,
Massabesic Gneiss, Brookville Gneiss
17_PARAGNEISS
17_VOL_FELSIC
Cambrian magmatism. Volcanic rocks (felsic). Dry Hill Gneiss, Massabesic
18
Passive margin
Mainly Cambrian to Lower Ordovician quartzose clastic slope-and-rise deposits;
locally contains mafic dikes. Albee Formation, Baskahegan Lake Formation, Grand
Pitch Formation, Cape Elizabeth Formation, Miramichi Group, Cookson Group,
Gander Group
19a
AVALONIA
Magmatic arc to rift
unconformity
Younger Neoproterozoic magmatic arcs ? felsic magmatic rocks with intermediate
and mafic magmatic rocks and marine to terrestrial clastic sedimentary rocks;
ca. 630 to 580 Ma. Dedham Granite, Marystown Group, Love Cove Group, Conception
Group, Broad River Group
19a_INT_FELSIC
ca. 630 to 580 Ma. Intrusive rocks (felsic). Dedham Granite, Marystown Group,
Love Cove Group, Conception Group, Broad River Group
19a_INT_MAFIC
ca. 630 to 580 Ma. Intrusive rocks (mafic). Dedham Granite, Marystown Group,
19a_SHEAR
ca. 630 to 580 Ma. Shear zone. Dedham Granite, Marystown Group, Love Cove
Group, Conception Group, Broad River Group
19a_VOL_FELSIC
ca. 630 to 580 Ma. Volcanic rocks (felsic). Dedham Granite, Marystown Group,
19a_VOL_MAFIC
ca. 630 to 580 Ma. Volcanic rocks (mafic). Dedham Granite, Marystown Group,
19b
Older Neoproterozoic magmatic arcs ? felsic magmatic rocks with intermediate
and mafic magmatic rocks and associated clastic sedimentary rocks; >670 Ma.
Stirling Group, Tickle Point Formation
19b_VOL_MAFIC
Volcanic rocks (mafic). Stirling Group, Tickle Point Formation
1_AMCS_BLUE
associated post-orogenic granitoid bodies. Anorthosite-mangerite-charnockite
suite rocks (gabbro, anorthosite). Elk Park Plutonic Suite, Mount Holly
1_AMCS_RED
suite rocks (mangerite, charnockite, granite). Elk Park Plutonic Suite, Mount
Holly Complex, Disappointment Hill Complex
1_INT_FELSIC
associated post-orogenic granitoid bodies. Intrusive rocks (felsic). Elk Park
Plutonic Suite, Mount Holly Complex, Disappointment Hill Complex
1_ORTHOGNEISS
associated post-orogenic granitoid bodies. Orthogneiss. Elk Park Plutonic
Suite, Mount Holly Complex, Disappointment Hill Complex
1_PARAGNEISS
associated post-orogenic granitoid bodies. Paragneiss and metavolcanic rock.
Elk Park Plutonic Suite, Mount Holly Complex, Disappointment Hill Complex
1_SHEAR
associated post-orogenic granitoid bodies. Shear zone. Elk Park Plutonic Suite,
Mount Holly Complex, Disappointment Hill Complex
1_VOL_FELSIC
associated post-orogenic granitoid bodies. Volcanic rocks (felsic). Elk Park
1a
associated post-orogenic granitoid bodies. Basement components >= 1.5 Ga.
1a_AMCS_BLUE
Anorthosite-mangerite-charnockite suite rocks (anorthosite).
20
Upper Neoproterozoic volcanic rocks with marine to terrestrial clastic
sedimentary rocks transitional between older magmatic-arc rocks and younger
clastic shelf. Boston Bay Group, Musgravetown Group, Coldbrook Group, Fourchu
20_INT_FELSIC
clastic shelf. Intrusive rocks (felsic). Boston Bay Group, Musgravetown Group,
Coldbrook Group, Fourchu Group
20_INT_MAFIC
clastic shelf. Intrusive rocks (mafic). Boston Bay Group, Musgravetown Group,
20_VOL_FELSIC
clastic shelf. Volcanic rocks (felsic). Boston Bay Group, Musgravetown Group,
20_VOL_MAFIC
clastic shelf. Volcanic rocks (mafic). Boston Bay Group, Musgravetown Group,
21
Clastic shelf
Upper Neoproterozoic to Lower Devonian clastic sedimentary rocks with local
carbonate rocks and mafic and felsic magmatic rocks; Middle Cambrian and
younger rocks lie unconformably on unit 19. Characterized by an ?Avalonian?
fauna. Conanicut Group, Saint John Group, Iron Brook Group, Wabana Group,
Braintree Argillite
22
MEGUMA
Abyssal fan deposits
Upper Neoproterozoic to Ordovician marine clastic sedimentary rocks. Meguma
22a
Upper Neoproterozoic to Ordovician marine clastic sedimentary rocks. Mainly
sandstone. Goldenville Formation
22b
dark shale. Halifax Formation
23
Mid-Paleozoic clastic wedge and time-equivalent rocks
on Laurentian Realm
Middle Ordovician to Lower Devonian, generally thin, shallow marine to
terrestrial, clastic sedimentary wedge with subordinate carbonate rocks and
chert. Includes unit 33 in southernmost Appalachians and carbonate rocks that
are either the cratonward equivalent of unit 6 or lie unconformably on rocks
deformed during the Taconic Orogeny. Tuscarora Formation, Tonoloway Formation,
Salina Group
25_INT_MAFIC
Mid-Paleozoic magmatism mainly in Axial Realm
Middle Ordovician to Lower Silurian plutonic rocks and orthogneiss mainly
confined to the Piedmont domain. Intrusive rocks (mafic). Shelton Granite
Gneiss, Cortlandt complex
27
Mid-Paleozoic upper-plate sedimentary and magmatic rocks
on Laurentian and Axial realms and Ganderia
Upper Ordovician to Upper Silurian, syntectonic, submarine to terrestrial
clastic locally calcareous sedimentary, and associated magmatic rocks of
extensional to arc affinity. Badger Group, Madrid Formation, Grog Brook Group,
Botwood Group
27_INT_FELSIC
extensional to arc affinity. Intrusive rocks (felsic). Badger Group, Madrid
Formation, Grog Brook Group, Botwood Group
27_INT_MAFIC
extensional to arc affinity. Intrusive rocks (mafic). Badger Group, Madrid
27_VOL_FELSIC
extensional to arc affinity. Volcanic rocks (felsic). Badger Group, Madrid
27_VOL_MAFIC
extensional to arc affinity. Volcanic rocks (mafic). Badger Group, Madrid
28
Marine foredeep basin
on Axial Realm and Ganderia
Upper Ordovician to Upper Silurian syntectonic submarine clastic sedimentary
rocks, commonly with calcareous siltstone. Merrimack Group, Bucksport
Formation, Kingsclear Group, Indian Islands Group
29
Silurian to Lowest Devonian arc and rifted-arc bimodal magmatic rocks and
associated marine sedimentary rocks confined to the Peri-Gondwanan Realm. Some
faunas exhibit ?Old World? affinities. Newbury Volcanic Complex, Eastport
Formation, Mascarene Group, Kingston Complex, La Poile Group, Burgeo batholith,
Cadillac Mountain pluton
29_INT_FELSIC
faunas exhibit ?Old World? affinities. Intrusive rocks (felsic). Newbury
Volcanic Complex, Eastport Formation, Mascarene Group, Kingston Complex, La
Poile Group, Burgeo batholith, Cadillac Mountain pluton
29_INT_MAFIC
faunas exhibit ?Old World? affinities. Intrusive rocks (mafic). Newbury
29_PARAGNEISS
faunas exhibit ?Old World? affinities. Paragneiss and metavolcanic rock.
Newbury Volcanic Complex, Eastport Formation, Mascarene Group, Kingston
Complex, La Poile Group, Burgeo batholith, Cadillac Mountain pluton
29_VOL_FELSIC
faunas exhibit ?Old World? affinities. Volcanic rocks (felsic). Newbury
29_VOL_MAFIC
faunas exhibit ?Old World? affinities. Volcanic rocks (mafic). Newbury Volcanic
Complex, Eastport Formation, Mascarene Group, Kingston Complex, La Poile Group,
Burgeo batholith, Cadillac Mountain pluton
3
Iapetus rift facies
Neoproterozoic to Cambrian mainly clastic sedimentary rocks filling rift basins
and associated magmatism related to Iapetan rifting. Locally contains fragments
of oceanic crust. Ocoee Supergroup, Catoctin Formation, Pinnacle Formation,
Tibbit Hill Formation, Bateau Formation, Lynchburg Formation
30
Mid-Paleozoic bimodal magmatism in Peri-Gondwanan Realm
Upper Ordovician to Lower Silurian bimodal alkalic magmatic rocks of unknown
tectonic affinity confined to Avalonia. Quincy Granite, Cape Ann pluton
30_INT_FELSIC
tectonic affinity confined to Avalonia. Intrusive rocks (felsic). Quincy
Granite, Cape Ann pluton
30_INT_MAFIC
tectonic affinity confined to Avalonia. Intrusive rocks (mafic). Quincy
31
Meguma cover sequence
on Meguma
Upper Ordovician to Devonian shallow marine to terrestrial, clastic sedimentary
and local magmatic rocks. Annapolis Supergroup
31_INT_FELSIC
and local magmatic rocks. Intrusive rocks (felsic). Annapolis Supergroup
32a
Syn-Acadian sedimentary and magmatic rocks
Upper Silurian and Lower Devonian mainly marine with subordinate terrestrial
clastic sedimentary rocks; commonly lying unconformably on pre-Upper Silurian
rocks. Calcareous rocks are locally prominent in the west. Includes non-arc
volcanic and associated bimodal magmatic rocks. Unit extends into Middle
Devonian in Gaspésie. Seboomook Group, upper part of Chaleurs Group (above
Salinic unconformity), Piscataquis magmatic suite
32a_INT_FELSIC
Devonian in Gaspésie. Intrusive rocks (felsic). Seboomook Group, upper part of
Chaleurs Group (above Salinic unconformity), Piscataquis magmatic suite
32a_INT_MAFIC
Devonian in Gaspésie. Intrusive rocks (mafic). Seboomook Group, upper part of
32a_VOL_FELSIC
Devonian in Gaspésie. Volcanic rocks (felsic). Seboomook Group, upper part of
32a_VOL_MAFIC
Devonian in Gaspésie. Volcanic rocks (mafic). Seboomook Group, upper part of
32b
Non-arc volcanic rocks and bimodal magmatic rocks of possibly unrelated
tectonic settings. Exeter pluton, North Pole pluton, Rose Blanche pluton, North
Bay batholith
32b_INT_FELSIC
tectonic settings. Intrusive rocks (felsic). Exeter pluton, North Pole pluton,
Rose Blanche pluton, North Bay batholith
32b_INT_MAFIC
tectonic settings. Intrusive rocks (mafic). Exeter pluton, North Pole pluton,
32b_VOL_FELSIC
tectonic settings. Volcanic rocks (felsic). Exeter pluton, North Pole pluton,
32b_VOL_MAFIC
tectonic settings. Volcanic rocks (mafic). Exeter pluton, North Pole pluton,
33
Acadian clastic wedge
Mainly Middle to Upper Devonian dominantly terrestrial clastic sedimentary
rocks deposited on the west flank (Catskill clastic wedge) and on interior
portions of the Appalachian Orogen; includes minor carbonate rocks. Hamilton
Group, Genesee Group, Sonyea Group
34
Middle Devonian to earliest Carboniferous plutonic rocks. Concord pluton, Deer
Isle Granite, South Mountain batholith, Ackley batholith
34_INT_FELSIC
Middle Devonian to earliest Carboniferous plutonic rocks. Intrusive rocks
(felsic). Concord pluton, Deer Isle Granite, South Mountain batholith, Ackley
batholith
34_INT_MAFIC
(mafic). Concord pluton, Deer Isle Granite, South Mountain batholith, Ackley
34_VOL_FELSIC
Middle Devonian to earliest Carboniferous plutonic rocks. Volcanic rocks
34_VOL_MAFIC
36
Middle Devonian to Permian mainly terrestrial and marine clastic sedimentary
rocks. Includes minor limestone, evaporite, and volcanic rocks. Commonly
deposited in fault-controlled basins, collectively referred to as the Maritimes
Basin in Canada. Narragansett Bay group, Horton Group, Pictou Group
36_INT_FELSIC
Basin in Canada. Intrusive rocks (felsic). Narragansett Bay group, Horton
Group, Pictou Group
36_VOL_FELSIC
Basin in Canada. Volcanic rocks (felsic). Narragansett Bay group, Horton Group,
Pictou Group
36_VOL_MAFIC
Basin in Canada. Volcanic rocks (mafic). Narragansett Bay group, Horton Group,
36a_INT_FELSIC
Late Devonian alkalic plutons related to Late Devonian rift-related volcanism
in the Narragansett basin. Scituate pluton
37_INT_FELSIC
Alleghanian plutonism
Carboniferous to Permian plutonic rocks. Intrusive rocks (felsic). Rolesville
batholith, Narragansett Pier pluton, Sebago pluton
38a
Continental rift basins and magmatism related to formation of the Atlantic Basin
Alluvial and lacustrine clastic sedimentary rocks and local basalt, granite,
syenite, gabbro, and minor felsic volcanic rocks; rift basins immediately
preceding formation of the Atlantic Ocean. Newark Supergroup, North Mountain
Basalt, Wolfville Formation
38a_INT_FELSIC
preceding formation of the Atlantic Ocean. Intrusive rocks (felsic). Newark
Supergroup, North Mountain Basalt, Wolfville Formation
38a_INT_MAFIC
preceding formation of the Atlantic Ocean. Intrusive rocks (mafic). Newark
38a_VOL_MAFIC
preceding formation of the Atlantic Ocean. Volcanic rocks (mafic). Newark
38b
New England?Quebec igneous suite; alkalic granite, syenite, and gabbro with
minor felsic volcanic rocks. White Mountain magmatic suite
38b_VOL_FELSIC
minor felsic volcanic rocks. Volcanic rocks (felsic). White Mountain magmatic
suite
39_INT_FELSIC
Plutonic rocks of unknown age and origin. Intrusive rocks (felsic). Greensboro
intrusive suite
39_INT_MAFIC
Plutonic rocks of unknown age and origin. Intrusive rocks (mafic). Greensboro
3_INT_FELSIC
of oceanic crust. Intrusive rocks (felsic). Ocoee Supergroup, Catoctin
Formation, Pinnacle Formation, Tibbit Hill Formation, Bateau Formation,
Lynchburg Formation
3_VOL_FELSIC
of oceanic crust. Volcanic rocks (felsic). Ocoee Supergroup, Catoctin
3_VOL_MAFIC
of oceanic crust. Volcanic rocks (mafic). Ocoee Supergroup, Catoctin Formation,
Pinnacle Formation, Tibbit Hill Formation, Bateau Formation, Lynchburg Formation
4
Iapetus drift facies - passive margin sequence
Knox?Beekmantown?St. George unconformity
Lower Paleozoic basal transgressive clastic sequence and overlying dominantly
carbonate platform sequence containing local clastic rocks. Chilhowee Group,
Knox Group, Beekmantown Group, Philipsburg Group, Port au Port Group, Potsdam
Sandstone
4_VOL_MAFIC
carbonate platform sequence containing local clastic rocks. Volcanic rocks
(mafic). Chilhowee Group, Knox Group, Beekmantown Group, Philipsburg Group,
Port au Port Group, Potsdam Sandstone
5
Continental slope-and-rise facies; locally may contain oceanic volcanic rocks
and rift-facies rocks. Conestoga Limestone, Ottauquechee Formation,
Trois-Pistoles Group, Northern Head Group, West Castleton Formation
6
Taconic clastic wedge
Westward-transgressive clastic wedges mainly derived from an eastern source and
associated mélange; includes deep-water carbonate rocks at base and some
time-equivalent carbonate rocks to the west (unit 23).
6b
time-equivalent carbonate rocks to the west (unit 23). Middle to Upper
Ordovician Taconic clastic wedge; gradational with unit 23. Martinsburg
Formation, Walloomsac Formation
6c
time-equivalent carbonate rocks to the west (unit 23). Lower to Upper
Ordovician Tourelle-Humber wedge; extends into Lower Silurian on Anticosti
Island. Tourelle Formation, Goose Tickle Group
ARBITRARY
Arcs used to close geological polygons
DEFINED
Geological boundary
FAULT
Undefined fault
LIMIT_MAPPING
Limit of mapping
MELANGE
Mélange and broken formation
NORMAL_FAULT
Normal fault
STRIKE_SLIP
Strike-slip (arrows indicate relative movement)
STRUCTURAL
An arc used to close a geological polygon along a linear feature
SUB_DEFINED
Submerged geological boundaries
SUB_FAULT
Submerged major structures
SUB_NORMAL_FLT
SUB_STRIKE_SLIP
SUB_THRUST_FLT
THRUST_FAULT
Thrust fault