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NARROW
Format
Article Type
Journal
Publisher
Section
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
East Africa
-
Sudan (1)
-
-
Mozambique Belt (1)
-
Nubian Shield (1)
-
Southern Africa
-
South Africa
-
Bushveld Complex (1)
-
Free State South Africa
-
Vredefort Dome (1)
-
-
Murchison greenstone belt (1)
-
Transvaal region (2)
-
-
-
-
Anglesey (2)
-
Arctic region
-
Svalbard
-
Spitsbergen
-
Spitsbergen Island
-
Ny Friesland (1)
-
-
-
-
-
Asia
-
Far East
-
Taiwan (1)
-
-
Himalayas
-
High Himalayan Crystallines (1)
-
Lesser Himalayas (1)
-
-
Indian Peninsula
-
Bhutan (1)
-
India
-
Gujarat India (1)
-
Himachal Pradesh India
-
Chamba India (1)
-
-
Maharashtra India
-
Nagpur India (1)
-
-
Rajasthan India
-
Udaipur India (2)
-
-
-
Nepal (1)
-
-
-
Australasia
-
Australia
-
Lachlan fold belt (1)
-
New South Wales Australia (1)
-
South Australia (1)
-
Victoria Australia
-
Bendigo Australia (1)
-
Stawell Australia (2)
-
-
Western Australia
-
Yandal greenstone belt (1)
-
Yilgarn Craton (1)
-
-
-
-
Canada
-
Eastern Canada
-
Newfoundland and Labrador
-
Newfoundland
-
Humber Arm Allochthon (1)
-
-
-
Ontario
-
Thunder Bay District Ontario
-
Thunder Bay Ontario (1)
-
-
Timiskaming District Ontario
-
Kirkland Lake Ontario (1)
-
-
-
Quebec
-
Gaspe Peninsula (1)
-
-
-
Western Canada
-
British Columbia (4)
-
Canadian Cordillera (2)
-
Canadian Rocky Mountains (1)
-
Yukon Territory (1)
-
-
-
Caribbean region
-
West Indies
-
Antilles
-
Greater Antilles
-
Jamaica (1)
-
-
-
-
-
Cascade Range (1)
-
Coast Ranges (1)
-
Dunnage Melange (1)
-
Europe
-
Alps
-
Swiss Alps
-
Southern Swiss Alps (1)
-
-
-
Central Europe
-
Switzerland
-
Swiss Alps
-
Southern Swiss Alps (1)
-
-
Valais Switzerland (1)
-
-
-
Pyrenees
-
French Pyrenees (2)
-
-
Southern Europe
-
Iberian Peninsula
-
Spain
-
Asturias Spain (1)
-
-
-
Italy
-
Apennines (2)
-
Calabria Italy (1)
-
Liguria Italy (1)
-
Sicily Italy
-
Peloritani Mountains (1)
-
-
-
-
Variscides (1)
-
Western Europe
-
France
-
French Pyrenees (2)
-
Pyrenees-Orientales France (1)
-
Var France
-
Maures Massif (1)
-
-
-
United Kingdom
-
Great Britain
-
Wales
-
Anglesey Wales (1)
-
Cardiganshire Wales
-
Aberystwyth Wales (1)
-
-
-
-
-
-
-
Green Mountains (1)
-
Mediterranean region
-
Calabrian Arc (1)
-
-
Mexico
-
Coahuila Mexico (1)
-
-
North America
-
Appalachians
-
Northern Appalachians (4)
-
Southern Appalachians (1)
-
-
Canadian Shield
-
Superior Province
-
Abitibi Belt (4)
-
Quetico Belt (1)
-
Wabigoon Belt (2)
-
Wawa Belt (1)
-
-
-
Great Lakes region (1)
-
Lake Superior region (1)
-
North American Cordillera
-
Canadian Cordillera (2)
-
-
Omineca Belt (1)
-
Rocky Mountain Trench (1)
-
Rocky Mountains
-
Canadian Rocky Mountains (1)
-
Northern Rocky Mountains (1)
-
Selkirk Mountains (1)
-
-
Shuswap Complex (1)
-
-
Rainy Lake (1)
-
San Juan Islands (1)
-
Sierra Nevada (3)
-
South America
-
Andes (1)
-
Brazil
-
Minas Gerais Brazil
-
Itabira Brazil (1)
-
Quadrilatero Ferrifero (1)
-
-
Sao Francisco Craton (1)
-
-
Patagonia (1)
-
-
United States
-
Arizona
-
Rincon Mountains (1)
-
-
California
-
Central California (2)
-
Fresno County California (1)
-
Madera County California (1)
-
Mariposa County California (2)
-
Mendocino County California (1)
-
Merced County California (1)
-
Stanislaus County California (1)
-
Tehama County California (1)
-
Tuolumne County California (2)
-
-
Connecticut (2)
-
Great Smoky Mountains (1)
-
Maine
-
Franklin County Maine (1)
-
-
Massachusetts (1)
-
Minnesota (1)
-
Nevada
-
Carlin Trend (1)
-
-
New England (1)
-
New Mexico
-
Picuris Range (1)
-
Taos Plateau (1)
-
Tusas Mountains (1)
-
-
New York
-
Onondaga County New York
-
Syracuse New York (1)
-
-
-
North Carolina
-
Haywood County North Carolina (1)
-
Swain County North Carolina (1)
-
-
Oklahoma (1)
-
Ouachita Mountains (1)
-
Pennsylvania
-
Berks County Pennsylvania
-
Reading Pennsylvania (1)
-
-
Philadelphia County Pennsylvania
-
Philadelphia Pennsylvania (2)
-
-
-
Texas
-
Blanco County Texas (1)
-
Burnet County Texas (1)
-
Gillespie County Texas (1)
-
Llano County Texas (1)
-
Llano Uplift (1)
-
Mason County Texas (1)
-
McCulloch County Texas (1)
-
San Saba County Texas (1)
-
-
Vermont
-
Windham County Vermont (1)
-
-
Washington
-
San Juan County Washington (1)
-
Skagit County Washington (1)
-
Whatcom County Washington (1)
-
-
Wisconsin
-
Sauk County Wisconsin
-
Baraboo Wisconsin (1)
-
-
-
Yavapai Province (1)
-
-
-
commodities
-
metal ores
-
antimony ores (1)
-
copper ores (1)
-
gold ores (8)
-
iron ores (1)
-
silver ores (1)
-
zinc ores (1)
-
-
mineral deposits, genesis (7)
-
petroleum (1)
-
-
elements, isotopes
-
carbon
-
C-13/C-12 (1)
-
organic carbon (1)
-
-
isotope ratios (4)
-
isotopes
-
radioactive isotopes
-
Pb-206/Pb-204 (2)
-
Pb-207/Pb-204 (2)
-
Pb-208/Pb-204 (1)
-
-
stable isotopes
-
C-13/C-12 (1)
-
O-18/O-16 (3)
-
Pb-206/Pb-204 (2)
-
Pb-207/Pb-204 (2)
-
Pb-208/Pb-204 (1)
-
-
-
metals
-
lead
-
Pb-206/Pb-204 (2)
-
Pb-207/Pb-204 (2)
-
Pb-208/Pb-204 (1)
-
-
niobium (1)
-
platinum group
-
palladium (1)
-
-
precious metals (1)
-
rare earths
-
yttrium (1)
-
-
titanium (1)
-
zirconium (1)
-
-
oxygen
-
O-18/O-16 (3)
-
-
-
geochronology methods
-
Ar/Ar (2)
-
Rb/Sr (1)
-
Re/Os (1)
-
U/Pb (6)
-
-
geologic age
-
Cenozoic
-
Tertiary (1)
-
-
Mesozoic
-
Cretaceous
-
Middle Cretaceous (1)
-
Upper Cretaceous (1)
-
-
Franciscan Complex (1)
-
Jurassic (3)
-
-
Paleozoic
-
Cambrian
-
Acadian (2)
-
Kanmantoo Group (1)
-
Middle Cambrian
-
Burgess Shale (1)
-
-
-
Carboniferous
-
Mississippian (1)
-
Pennsylvanian
-
Upper Pennsylvanian (1)
-
-
-
Devonian
-
Middle Devonian
-
Eifelian (1)
-
Marcellus Shale (1)
-
-
Upper Devonian
-
Famennian (1)
-
-
-
lower Paleozoic
-
Glenarm Series (2)
-
-
Ordovician (5)
-
Permian (4)
-
Silurian (2)
-
upper Paleozoic (1)
-
Wissahickon Formation (2)
-
-
Precambrian
-
Archean
-
Aravalli System (2)
-
Neoarchean (1)
-
Sausar Series (1)
-
Timiskaming Group (1)
-
-
Delhi Supergroup (1)
-
Great Smoky Group (1)
-
middle Precambrian (1)
-
upper Precambrian
-
Proterozoic
-
Algonkian
-
Baraboo Quartzite (1)
-
-
Miette Group (1)
-
Neoproterozoic
-
Hadrynian (1)
-
-
Paleoproterozoic
-
Thomson Formation (1)
-
-
-
-
Witwatersrand Supergroup (1)
-
-
-
igneous rocks
-
igneous rocks
-
plutonic rocks
-
granites
-
leucogranite (1)
-
S-type granites (1)
-
-
granodiorites (2)
-
pegmatite (1)
-
ultramafics (1)
-
-
volcanic rocks
-
basalts
-
mid-ocean ridge basalts (1)
-
-
-
-
ophiolite (2)
-
-
metamorphic rocks
-
metamorphic rocks
-
amphibolites (2)
-
gneisses
-
orthogneiss (3)
-
paragneiss (2)
-
-
granulites (1)
-
hornfels (1)
-
marbles (1)
-
metaigneous rocks
-
metabasalt (2)
-
-
metaplutonic rocks (1)
-
metasedimentary rocks
-
metagraywacke (1)
-
metapelite (1)
-
paragneiss (2)
-
-
metavolcanic rocks (2)
-
migmatites (3)
-
mylonites
-
ultramylonite (1)
-
-
phyllites (1)
-
quartzites (1)
-
schists
-
biotite schist (1)
-
-
slates (1)
-
-
ophiolite (2)
-
turbidite (3)
-
-
minerals
-
carbonates
-
calcite (1)
-
dolomite (1)
-
-
minerals (1)
-
oxides
-
brucite (1)
-
-
phosphates
-
apatite (1)
-
monazite (1)
-
-
silicates
-
chain silicates
-
pyroxene group
-
clinopyroxene
-
jadeite (1)
-
-
-
-
framework silicates
-
feldspar group
-
plagioclase
-
albite (2)
-
-
-
silica minerals
-
quartz (1)
-
-
-
orthosilicates
-
nesosilicates
-
garnet group (5)
-
kyanite (1)
-
staurolite (2)
-
titanite group
-
titanite (1)
-
-
zircon group
-
zircon (2)
-
-
-
sorosilicates
-
lawsonite (1)
-
-
-
ring silicates
-
tourmaline group (1)
-
-
sheet silicates
-
chlorite group
-
chlorite (1)
-
-
clay minerals (1)
-
mica group
-
biotite (2)
-
-
-
-
sulfides
-
pyrite (1)
-
-
-
Primary terms
-
absolute age (6)
-
Africa
-
East Africa
-
Sudan (1)
-
-
Mozambique Belt (1)
-
Nubian Shield (1)
-
Southern Africa
-
South Africa
-
Bushveld Complex (1)
-
Free State South Africa
-
Vredefort Dome (1)
-
-
Murchison greenstone belt (1)
-
Transvaal region (2)
-
-
-
-
Arctic region
-
Svalbard
-
Spitsbergen
-
Spitsbergen Island
-
Ny Friesland (1)
-
-
-
-
-
Asia
-
Far East
-
Taiwan (1)
-
-
Himalayas
-
High Himalayan Crystallines (1)
-
Lesser Himalayas (1)
-
-
Indian Peninsula
-
Bhutan (1)
-
India
-
Gujarat India (1)
-
Himachal Pradesh India
-
Chamba India (1)
-
-
Maharashtra India
-
Nagpur India (1)
-
-
Rajasthan India
-
Udaipur India (2)
-
-
-
Nepal (1)
-
-
-
Australasia
-
Australia
-
Lachlan fold belt (1)
-
New South Wales Australia (1)
-
South Australia (1)
-
Victoria Australia
-
Bendigo Australia (1)
-
Stawell Australia (2)
-
-
Western Australia
-
Yandal greenstone belt (1)
-
Yilgarn Craton (1)
-
-
-
-
Canada
-
Eastern Canada
-
Newfoundland and Labrador
-
Newfoundland
-
Humber Arm Allochthon (1)
-
-
-
Ontario
-
Thunder Bay District Ontario
-
Thunder Bay Ontario (1)
-
-
Timiskaming District Ontario
-
Kirkland Lake Ontario (1)
-
-
-
Quebec
-
Gaspe Peninsula (1)
-
-
-
Western Canada
-
British Columbia (4)
-
Canadian Cordillera (2)
-
Canadian Rocky Mountains (1)
-
Yukon Territory (1)
-
-
-
carbon
-
C-13/C-12 (1)
-
organic carbon (1)
-
-
Caribbean region
-
West Indies
-
Antilles
-
Greater Antilles
-
Jamaica (1)
-
-
-
-
-
Cenozoic
-
Tertiary (1)
-
-
crust (7)
-
crystal growth (2)
-
crystal structure (2)
-
deformation (38)
-
diagenesis (2)
-
electron microscopy (1)
-
engineering geology (1)
-
Europe
-
Alps
-
Swiss Alps
-
Southern Swiss Alps (1)
-
-
-
Central Europe
-
Switzerland
-
Swiss Alps
-
Southern Swiss Alps (1)
-
-
Valais Switzerland (1)
-
-
-
Pyrenees
-
French Pyrenees (2)
-
-
Southern Europe
-
Iberian Peninsula
-
Spain
-
Asturias Spain (1)
-
-
-
Italy
-
Apennines (2)
-
Calabria Italy (1)
-
Liguria Italy (1)
-
Sicily Italy
-
Peloritani Mountains (1)
-
-
-
-
Variscides (1)
-
Western Europe
-
France
-
French Pyrenees (2)
-
Pyrenees-Orientales France (1)
-
Var France
-
Maures Massif (1)
-
-
-
United Kingdom
-
Great Britain
-
Wales
-
Anglesey Wales (1)
-
Cardiganshire Wales
-
Aberystwyth Wales (1)
-
-
-
-
-
-
-
faults (23)
-
folds (47)
-
foliation (82)
-
fractures (9)
-
geochemistry (3)
-
geochronology (2)
-
geophysical methods (1)
-
igneous rocks
-
plutonic rocks
-
granites
-
leucogranite (1)
-
S-type granites (1)
-
-
granodiorites (2)
-
pegmatite (1)
-
ultramafics (1)
-
-
volcanic rocks
-
basalts
-
mid-ocean ridge basalts (1)
-
-
-
-
inclusions
-
fluid inclusions (1)
-
-
intrusions (10)
-
isotopes
-
radioactive isotopes
-
Pb-206/Pb-204 (2)
-
Pb-207/Pb-204 (2)
-
Pb-208/Pb-204 (1)
-
-
stable isotopes
-
C-13/C-12 (1)
-
O-18/O-16 (3)
-
Pb-206/Pb-204 (2)
-
Pb-207/Pb-204 (2)
-
Pb-208/Pb-204 (1)
-
-
-
lava (1)
-
lineation (15)
-
magmas (2)
-
Mediterranean region
-
Calabrian Arc (1)
-
-
Mesozoic
-
Cretaceous
-
Middle Cretaceous (1)
-
Upper Cretaceous (1)
-
-
Franciscan Complex (1)
-
Jurassic (3)
-
-
metal ores
-
antimony ores (1)
-
copper ores (1)
-
gold ores (8)
-
iron ores (1)
-
silver ores (1)
-
zinc ores (1)
-
-
metals
-
lead
-
Pb-206/Pb-204 (2)
-
Pb-207/Pb-204 (2)
-
Pb-208/Pb-204 (1)
-
-
niobium (1)
-
platinum group
-
palladium (1)
-
-
precious metals (1)
-
rare earths
-
yttrium (1)
-
-
titanium (1)
-
zirconium (1)
-
-
metamorphic rocks
-
amphibolites (2)
-
gneisses
-
orthogneiss (3)
-
paragneiss (2)
-
-
granulites (1)
-
hornfels (1)
-
marbles (1)
-
metaigneous rocks
-
metabasalt (2)
-
-
metaplutonic rocks (1)
-
metasedimentary rocks
-
metagraywacke (1)
-
metapelite (1)
-
paragneiss (2)
-
-
metavolcanic rocks (2)
-
migmatites (3)
-
mylonites
-
ultramylonite (1)
-
-
phyllites (1)
-
quartzites (1)
-
schists
-
biotite schist (1)
-
-
slates (1)
-
-
metamorphism (33)
-
metasomatism (6)
-
Mexico
-
Coahuila Mexico (1)
-
-
mineral deposits, genesis (7)
-
mineralogy (1)
-
minerals (1)
-
North America
-
Appalachians
-
Northern Appalachians (4)
-
Southern Appalachians (1)
-
-
Canadian Shield
-
Superior Province
-
Abitibi Belt (4)
-
Quetico Belt (1)
-
Wabigoon Belt (2)
-
Wawa Belt (1)
-
-
-
Great Lakes region (1)
-
Lake Superior region (1)
-
North American Cordillera
-
Canadian Cordillera (2)
-
-
Omineca Belt (1)
-
Rocky Mountain Trench (1)
-
Rocky Mountains
-
Canadian Rocky Mountains (1)
-
Northern Rocky Mountains (1)
-
Selkirk Mountains (1)
-
-
Shuswap Complex (1)
-
-
orogeny (12)
-
oxygen
-
O-18/O-16 (3)
-
-
paleoclimatology (1)
-
paleogeography (3)
-
Paleozoic
-
Cambrian
-
Acadian (2)
-
Kanmantoo Group (1)
-
Middle Cambrian
-
Burgess Shale (1)
-
-
-
Carboniferous
-
Mississippian (1)
-
Pennsylvanian
-
Upper Pennsylvanian (1)
-
-
-
Devonian
-
Middle Devonian
-
Eifelian (1)
-
Marcellus Shale (1)
-
-
Upper Devonian
-
Famennian (1)
-
-
-
lower Paleozoic
-
Glenarm Series (2)
-
-
Ordovician (5)
-
Permian (4)
-
Silurian (2)
-
upper Paleozoic (1)
-
Wissahickon Formation (2)
-
-
paragenesis (4)
-
petroleum (1)
-
petrology (5)
-
phase equilibria (2)
-
plate tectonics (6)
-
Precambrian
-
Archean
-
Aravalli System (2)
-
Neoarchean (1)
-
Sausar Series (1)
-
Timiskaming Group (1)
-
-
Delhi Supergroup (1)
-
Great Smoky Group (1)
-
middle Precambrian (1)
-
upper Precambrian
-
Proterozoic
-
Algonkian
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
slip cleavage
Late Paleozoic magmatism and foreland deformation associated with opening and closing of marginal basins in the North Patagonian Andes Available to Purchase
Melt Enhanced Deformation in Migmatites of Higher Himalayan Crystallines (HHC), India Available to Purchase
Deformation and metasomatism recorded by single-grain apatite petrochronology Available to Purchase
On the development of kink-bands: A case study in the Westasturian-Leonese Zone (Variscan belt, NW Spain) Open Access
Early gold-bearing quartz veins within the Rivière-Héva fault zone, Abitibi subprovince, Quebec, Canada Available to Purchase
Subduction, accretion, and exhumation of coherent Franciscan blueschist-facies rocks, northern Coast Ranges, California Open Access
Palaeozoic metamorphism of the Neoproterozoic basement in NE Cathaysia: zircon U–Pb ages, Hf isotope and whole-rock geochemistry from the Chencai Group Available to Purchase
The structural interpretation of domainal trace lineation: an example from the Mona Complex, Anglesey Available to Purchase
Time–space relationships among structural and metamorphic aureoles related to granite emplacement: a case study from the Serre Massif (southern Italy) Available to Purchase
Coupled deformation and metamorphism in the roof of a tabular midcrustal igneous complex Available to Purchase
The Baraboo District—A North American classic Available to Purchase
ABSTRACT The Baraboo District includes an exceptional array of outcrops that have provided geological enlightenment to students and professionals, alike, for 150 years. In the late nineteenth century, several fundamental structural principles were developed here, such as criteria for determining stratigraphic facing and the significance of cleavage-bedding relations. More recent studies of deformational features in the folded Baraboo Quartzite, such as crenulation cleavage and quartz fabrics, have yielded insights into the kinematics of folding in the District and the significance of regional tectonics in the context of the Proterozoic assembly of North America. Additional petrologic, geochemical, and isotopic studies have established the age of the Baraboo Quartzite (≤1700 Ma), identified a Paleoproterozoic weathering profile, confirmed the supermature composition of the Baraboo Quartzite, established the presence of geon 14 hydrothermal alteration, and elucidated the Proterozoic tectonothermal evolution of the District, all of which bear importantly on Proterozoic tectonic, atmospheric, and climatic conditions in the southern Lake Superior region. By Late Cambrian time, the Baraboo Quartzite was a ring of islands, which was abutted by spectacular conglomerates deposited by tropical storms. These were surrounded by more distal sandstones and were eventually buried by Ordovician dolomite and sandstone. During the field trip, we will visit eleven localities, which have been selected to illustrate the key geological features of this North American classic.
The tectono-thermal evolution of the Waterbury dome, western Connecticut, based on U-Pb and 40 Ar/ 39 Ar ages Available to Purchase
The Waterbury dome, located in the Rowe-Hawley zone in western Connecticut, is a triple window exposing three terranes: parautochthonous or allochthonous peri-Laurentian rocks in its lowest level 1, allochthonous rocks of the Rowe-Hawley zone in its middle level 2, and allochthonous cover rocks, including Silurian-Devonian rocks of the Connecticut Valley Gaspé trough, in its highest level 3. Levels 1 and 2 are separated by the Waterbury thrust, a fault equivalent to Cameron's Line, the Taconic suture in southwestern New England. Relict mesoscopic folds and foliation in levels 1 and 2 are truncated by a dominant D 2 migmatitic layering and are likely Taconic. U-Pb zircon crystallization ages of felsic orthogneiss and tonalite, syntectonic with respect to the formation of S 2 , and a biotite quartz diorite that crosscuts level 2 paragneiss are 437 ± 4 Ma, 434 ± 4 Ma, and 437 ± 4 Ma, respectively. Level 3 nappes were emplaced over the Waterbury dome along an Acadian décollement synchronous with the formation of a D 3 thrust duplex in the dome. The décollement truncates the Ky + Kfs-in (migmatite) isograd in the dome core and a St-in isograd in level 3 nappes, indicating that peak metamorphic conditions in the dome core and nappe cover rocks formed in different places at different times. Metamorphic overgrowths on zircon from the felsic orthogneiss in the Waterbury dome have an age of 387 ± 5 Ma. Rocks of all levels and the décollement are folded by D 4 folds that have a strongly developed, regional crenulation cleavage and D 5 folds. The Waterbury dome was formed by thrust duplexing followed by fold interference during the Acadian orogeny. The 40 Ar/ 39 Ar ages of amphibole, muscovite, biotite, and K-feldspar from above and below the décollement are ca. 378 Ma, 355 Ma, 360 Ma (above) and 340 (below), and 288 Ma, respectively. Any kilometer-scale vertical movements between dome and nappe rocks were over by ca. 378 Ma. Core and cover rocks of the Waterbury dome record synchronous, post-Acadian cooling.
Development of Framboidal Pyrite During Diagenesis, Low-Grade Regional Metamorphism, and Hydrothermal Alteration Available to Purchase
Reinterpretation of the Greenbrier fault, Great Smoky Mountains: New petrofabric constraints and implications for southern Appalachian tectonics Available to Purchase
Geologic and Structural Setting of Gold Mineralization in the Kirkland Lake-Larder Lake Gold Belt, Ontario Available to Purchase
Timing of Gold Mineralization Relative to the Peak of Metamorphism at Bronzewing, Western Australia Available to Purchase
Cleavage fronts and fans as reflections of orogen stress and kinematics in Taiwan Available to Purchase
Appalachian orogenesis: The role of repeated gravitational collapse Available to Purchase
Orogenesis within the New England Appalachians has classically been regarded as occurring discontinuously even though the collision of plates driving it was essentially continuous for 200 million years from the Taconic through the Alleghanian orogenies. Structural, metamorphic, and age data obtained from the cores of porphyroblasts reveal a near continuous history of tectonism that is partitioned within and between outcrops as well as regionally. Very prolonged deformation and metamorphic histories predate the foliation parallel to bedding, and the oblique matrix foliations only reflect brief increments of the uplift path of these rocks back to the earth's surface. The matrix shows none of the structural effects of the path down into the crust. This deepening path is revealed by the sequences of foliations that developed about regionally consistent successions of foliation intersection axis trends preserved within porphyroblasts (FIAs). Indirect coupling between plates throughout the period of collision resulted in horizontal shortening accompanied by subvertical foliation development, followed by crustal instability, collapse, and the formation of subhorizontal foliation, repeated over and over until orogenesis ceased. These cycles repeat on time scales as short as 100,000 to 500,000 years, but because of partitioning of the deformation, only the weakest rocks preserve much of this history. Shifting directions of relative plate motion every 5 to 30 million years also results in easily deformed rocks being protected by more competent ones, with none of them seeing the total history. Furthermore, if the bulk composition is not suitable for porphyroblast growth, none of this history will be recorded. The recurring role of gravitational collapse and the variable scale of partitioning of this type of deformation is obscured by repeated reactivation of the bedding parallel foliation in multiply deformed rocks containing porphyroblasts in the New England Appalachians. It is also obscured by the lack of topographic relief relative to total crustal thickness.