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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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East Africa
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Somali Republic (1)
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North Africa
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Morocco
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Southern Africa
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Asia
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Far East
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China
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lead
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rare earths
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samarium
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rhenium
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titanium (2)
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nitrogen
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oxygen
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silicon (1)
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fossils
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geologic age
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Tertiary
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Mesozoic
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Upper Cretaceous (1)
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Franciscan Complex (6)
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Triassic (1)
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upper Mesozoic (2)
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Paleozoic
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Bucksport Formation (1)
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Cape Elizabeth Formation (3)
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upper Paleozoic (1)
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Precambrian
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upper Precambrian
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Proterozoic
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Paleoproterozoic (1)
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igneous rocks
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volcanic rocks
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ophiolite (7)
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minerals
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native elements
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oxides
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phosphates
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silicates
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chain silicates
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amphibole group
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clinoamphibole
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hornblende (3)
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nephrite (1)
-
-
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jade (2)
-
pyroxene group
-
clinopyroxene
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omphacite (2)
-
-
-
-
framework silicates
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feldspar group
-
alkali feldspar
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K-feldspar (1)
-
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plagioclase
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albite (1)
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silica minerals
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quartz (1)
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garnierite (1)
-
orthosilicates
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nesosilicates
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garnet group (5)
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titanite group
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titanite (1)
-
-
zircon group
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zircon (19)
-
-
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sorosilicates
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lawsonite (1)
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sheet silicates
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clay minerals (2)
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illite (1)
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mica group
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phengite (2)
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serpentine group
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talc (1)
-
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sulfates (1)
-
sulfides
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molybdenite (1)
-
-
-
Primary terms
-
absolute age (27)
-
Africa
-
East Africa
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Somali Republic (1)
-
-
North Africa
-
Morocco
-
Rif
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Beni Bouchera (2)
-
-
-
-
Southern Africa
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South Africa
-
Bushveld Complex (1)
-
-
-
-
Asia
-
Central Asia
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Kazakhstan
-
Kokchetav Kazakhstan
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Kokchetav Massif (1)
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-
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Far East
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China
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Anhui China (1)
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Dabie Mountains (1)
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North China Platform (1)
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Shandong China (1)
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Xinjiang China (1)
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Xizang China (2)
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Yangtze River valley (1)
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Indonesia (1)
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Japan
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Kyushu (1)
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Himalayas (1)
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India
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Karnataka India (1)
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Madhya Pradesh India
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Chhindwara India (1)
-
-
-
Jammu and Kashmir
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Ladakh (1)
-
-
-
Indus-Yarlung Zangbo suture zone (2)
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Kamchatka Russian Federation
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Kamchatka Peninsula
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Tolbachik (1)
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-
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Kyrgyzstan (1)
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Middle East
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Iran
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Elburz (1)
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Zagros (1)
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Qiangtang Terrane (1)
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Siberian Platform
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Aldan Shield (1)
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Tajikistan (2)
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Tien Shan
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Alai Range
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Hissar Range (1)
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Turkestan (1)
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Yakutia Russian Federation (1)
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Atlantic Ocean
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North Atlantic
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Gulf of Mexico (1)
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North Sea (1)
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Australasia
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bibliography (1)
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biography (1)
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Canada
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Newfoundland and Labrador
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Ontario
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Western Canada
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carbon
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Caribbean region
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Virgin Islands (1)
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Cenozoic
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Quaternary
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Holocene (3)
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Pleistocene (2)
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Tertiary
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Neogene
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Miocene (4)
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Pliocene (3)
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Paleogene
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Casco Bay
Tectonic setting and regional correlation of Ordovician metavolcanic rocks of the Casco Bay Group, Maine: evidence from trace element and isotope geochemistry
Silurian deformation and metamorphism of Ordovician arc rocks of the Casco Bay Group, south-central Maine
Deglaciation and relative sea-level chronology, Casco Bay Lowland and lower Androscoggin River valley, Maine
Kinematic indicators for regional dextral shear along the Norumbega fault system in the Casco Bay area, coastal Maine
Dextral transpression at the Casco Bay restraining bend, Norumbega fault zone, coastal Maine
Casco Bay Group, South Portland and Cape Elizabeth, Maine
Location This site consists of shoreline exposures of the Casco Bay Group between Spring Point, South Portland, and Two Lights State Park, Cape Elizabeth, and roadcuts along Maine 77 in Cape Elizabeth (Fig. 1). The following places are designated as stops where important aspects of the geology of the Casco Bay Group can be seen: (1) Southern Maine Vocational Technical Institute, South Portland; (2) Willard Beach, South Portland; (3) Danford Cove, South Portland; (4) Portland Head Light, Cape Elizabeth; (5) Chimney Rock, Cape Elizabeth; (6) road-cut exposures of the Scarboro Formation and Spurwink Metalimestone, Cape Elizabeth; and (7) Two Lights State Park, Cape Elizabeth. The public has access to the shoreline at Stops 1 through 4,6, and 7, but at Stop 5 and other parts of the shoreline, permission to visit rock exposures must be obtained from individual landowners. The public does not have the right to walk along the intertidal zone without permission. In general, parking is very limited at private localities, and town ordinances generally prohibit parking along town roadways.
Stratigraphic correlation chart for rocks in the Casco Bay area, coastal Ma...
Geological map of folded rocks of the upper Casco Bay Group in south-centra...
Figure 1. Generalized geologic map of northern Casco Bay region of southwes...
Geologic map of folded rocks of the upper Casco Bay Group in south-central ...
Photographs of the Casco Bay Group in south-central Maine. ( a ) Interlayer...
Tectonic time table for the upper part of the Casco Bay Group and the surro...
The tectono-stratigraphic framework and evolution of southwestern Maine and southeastern New Hampshire
Five belts of metamorphosed sedimentary and volcanic rocks underlie southwestern Maine and southeastern New Hampshire: Middle Ordovician Falmouth-Brunswick sequence; Middle and Late Ordovician Casco Bay Group, and Late Ordovician to Early Silurian rocks of the Merribuckfred Basin; Late Ordovician to Early Silurian rocks of the East Harpswell Group; Silurian to Early Devonian rocks of the Central Maine Basin; and highly tectonized enigmatic rocks of the Rye complex of uncertain age. Stratigraphic reassessment and new U/Pb zircon ages support a model of east-directed Middle Ordovician subduction beneath Miramichi, a peri-Gondwanan block, and formation of the Falmouth-Brunswick–Casco Bay volcanic arc complex that is roughly correlative with arc activity on strike in New Brunswick. Passive Late Ordovician sedimentation in a reducing restricted backarc basin followed. Late Ordovician to Early Silurian volcanic rocks and volcanogenic sediments (East Harpswell Group) support west-directed subduction under the Miramichi block. Late Ordovician to Early Silurian turbidites accumulated in the Merribuckfred Basin between the Falmouth-Brunswick–Casco Bay arc and Ganderia to the east. The collision of Ganderia with the Falmouth Brunswick arc in Late Silurian time represents an early phase of the Acadian orogeny, during which the Merribuckfred rocks were deformed, metamorphosed, intruded, and uplifted. Simultaneously and inboard, the Central Maine Basin received sediment eroded mostly from Laurentia. Later, during the Late Silurian and Early Devonian, uplifted Merribuckfred basin rocks became the major source of sediments for the Central Maine Basin. A later phase of the Acadian orogeny resulted in Middle Devonian deformation, metamorphism, and intrusion of rocks of all six belts.
Geochronology, geochemistry, and tectonic setting of Ordovician metavolcanic rocks in the Liberty–Orrington belt, Maine: implications for the evolution of peri-Gondwanan arcs in the northern Appalachians
Assessing the role of orogen-parallel faulting in post-orogenic exhumation: low-temperature thermochronology across the Norumbega Fault System, Maine
Where is the Iapetus suture in northern New England? A study of the Ammonoosuc Volcanics, Bronson Hill terrane, New Hampshire 1 This article is one of a series of papers published in this CJES Special Issue: In honour of Ward Neale on the theme of Appalachian and Grenvillian geology.
Contrasting thermal histories across the Flying Point fault, southwestern Maine: Evidence for Mesozoic displacement
The Acadian orogeny in the North Atlantic region is assessed in this chapter in the light of mid-Paleozoic tectonics; throughout, plate tectonic nomenclature is used, and cycles are avoided. In North America nine regions bearing the imprint of the Acadian orogeny are recognized. In Newfoundland, in the Maritime Provinces of Canada, and in Vermont and New Hampshire a continuous sequence of lithotectonic belts correlates along the orogen. The Bronson Hill belt, although a continuous structure in southern New England, is not recognized as such but splits into two structures northeast of the Maine-New Hampshire border: the Boundary Mountain anticlinorium and the Lobster Mountain anticlinorium. Other lithotectonic belts are partly continuous from Canada into the United States; they include: (1) North-Central Maine belt, (2) Aroostook-Matapedia belt, (3) Miramichi belt, (4) Fredericton-Central Maine belt, (5) Richmond belt, (6) Casco Bay belt, (7) Benner Hill belt, (8) St. Croix-Ellsworth belt, (9) Mascarene belt, and (10) Avalon belt. The decision as to whether each of these belts represents a separate terrane is at present reserved. In the coastal Maine zone the situation is particularly complex, and belts 6 through 10 can be recognized there. In Massachusetts, we interpret the Merrimack Trough belt as in fault contact with both the Kearsarge-Central Maine and Bronson Hill belts to the northwest, and in Connecticut, with the Bronson Hill belt alone. Additionally, the Merrimack Trough belt is in fault contact with the Putnam-Nashoba belt to the southeast. The latter shows mainly a Taconian metamorphism and extensive intrusion of granites; clear evidence for Acadian orogenic effects in the Putnam-Nashoba belt is lacking. In Newfoundland the main orogeny appears to be Silurian in age, and the same is true of New Brunswick, whereas in the Meguma of Nova Scotia the Devonian deformation and intrusive activity continue from the Devonian to the Carboniferous. Correlations with the south-central Appalachians indicate a possibility of significant Acadian transpressional effects. The most recent evidence of a new microfossil find, however, implies that considerable Acadian deformation occurred in the Southern Appalachians, although it may have been directly continuous with earlier Taconian events. The Acadian metamorphism in the Northern Appalachians is associated with numerous granites, in general ranging in age from the Silurian to the Carboniferous. The earlier Silurian granites may have originated along the Iapetus suture or may be associated with transcurrent faults. The plate tectonic interpretation of the orogenic system is based on a model of successive blocks (terranes) approaching and colliding with North America and squeezing intervening sediments and volcanics. This took place over a fairly prolonged period of time.
Structural sequence and tectonic significance of Mesozoic dikes in southern coastal Maine
Mesozoic dikes in southern Maine occur within a 15–20-km-wide northeast-trending coast-parallel swarm ~150 km in length. The swarm is best exposed from Kittery to Ogunquit, but extends northeast into the Casco Bay area and southwest into New Hampshire. The dikes are dominantly mafic (dolerites and lamprophyres) but syenitic and granitic varieties are also present. Composite and multiple intrusive relations are common. Average dike width is 1.12 m and maximum dike width is ~25 m. Maximum extension values of 23% and dike intensities of 176 dikes/kilometer are found along the interpreted swarm axis. Dike orientations are dominantly northeast-trending and steeply dipping with apparent maxima at N60°E, N45°E, and N35°E, as well as minor northwest trends. These trends reflect a strong structural control on intrusion by the N60°E vertical bedding and a N45°E vertical cleavage in the host Kittery Formation. The horizontal component for dike dilation is dominantly N55°W-S55°E, which results in many sinistral-oblique opening directions and left-stepping en echelon offsets for the more structurally controlled dikes. Most of the mafic dikes were intruded between the syenite-alkaline granite phase and the later biotite granite phase of the Triassic Agamenticus alkaline intrusive complex. Dike intrusion was also contemporaneous with the emplacement of Triassic explosive igneous breccias at Gerrish Island, but prior to the intrusion of the Late Cretaceous Cape Neddick gabbro complex. A linear dike swarm: central intrusive complex model based on the Tertiary igneous province of northwest Scotland is adopted for this phase of early Mesozoic magmatism. The linear coast-parallel dike swarm and associated Triassic Agamenticus alkaline intrusive complex in southern Maine are part of the coastal New England igneous province of McHone and Butler; a 500-km-long, north-northeast-trending zone of crustal extension that includes the early Mesozoic dikes of eastern Massachusetts and Rhode Island to the southwest developed during Triassic rifting.