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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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Adrar des Iforas (1)
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East Africa
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Sudan
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Darfur (1)
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North Africa
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Algeria
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Ahaggar (2)
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Atlas Mountains
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Moroccan Atlas Mountains
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High Atlas (88)
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Ghadames Basin (1)
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Libya
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Morocco
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Bou Azzer (13)
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Marrakech Morocco (4)
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Moroccan Atlas Mountains
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Anti-Atlas (90)
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High Atlas (88)
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Middle Atlas (31)
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Moulouya River (4)
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Rif
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Tafilalt (4)
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Tell (2)
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Vertebrata
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Reptilia
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Echinodermata
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Crinozoa
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Echinozoa
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Mollusca
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Bivalvia (2)
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Cephalopoda
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Ammonoidea
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Ammonites (2)
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Goniatitida
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Hyolithes (1)
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Tentaculitida
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Porifera (2)
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Vermes
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Paleozoic
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Primary terms
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absolute age (20)
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Africa
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Adrar des Iforas (1)
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East Africa
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Sudan
-
Darfur (1)
-
-
-
North Africa
-
Algeria
-
Ahaggar (2)
-
-
Atlas Mountains
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Moroccan Atlas Mountains
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Anti-Atlas (90)
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High Atlas (88)
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Middle Atlas (31)
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-
-
Ghadames Basin (1)
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Illizi Basin (1)
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Libya
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Murzuk Basin (1)
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-
Morocco
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Bou Azzer (13)
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Casablanca Morocco (1)
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Marrakech Morocco (4)
-
Moroccan Atlas Mountains
-
Anti-Atlas (90)
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High Atlas (88)
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Middle Atlas (31)
-
-
Moulouya River (4)
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Rif
-
Beni Bouchera (1)
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-
Tafilalt (4)
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Taza Morocco (1)
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Tell (2)
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Tindouf Basin (1)
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Western Sahara (1)
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Sahara (1)
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Southern Africa
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Tibesti Massif (1)
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West Africa
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Benin (1)
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Ghana (1)
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Ivory Coast (1)
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Togo (1)
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West African Craton (2)
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West African Shield (6)
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Asia
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Central Asia
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Kazakhstan (1)
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Far East
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China (1)
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Siberia (1)
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Atlantic Ocean
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Atlantic Ocean Islands
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barite deposits (2)
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biogeography (9)
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brines (5)
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Canada
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Meguma Terrane (1)
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carbon
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Cenozoic
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Quaternary
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Holocene
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upper Holocene (1)
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Pleistocene
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lower Pleistocene (1)
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upper Pleistocene
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upper Weichselian
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Younger Dryas (1)
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Tertiary
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Neogene
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Miocene
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upper Miocene
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Messinian (1)
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Pliocene (4)
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Paleogene
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Eocene
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middle Eocene (1)
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Paleocene
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upper Paleocene
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Thanetian (1)
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Chordata
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Vertebrata
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Tetrapoda
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Reptilia
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Diapsida
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Archosauria
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dinosaurs
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Saurischia
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Theropoda
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Coelurosauria
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Deep Sea Drilling Project
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IPOD
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Leg 79 (2)
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Leg 41
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DSDP Site 369 (1)
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deformation (14)
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Europe
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Moroccan Atlas Mountains
Bedrock structural control on catchment-scale connectivity and alluvial fan processes, High Atlas Mountains, Morocco
Abstract Lithology is acknowledged to be an important internal catchment control on flow processes to adjacent alluvial fans. However, the role of inherited structural configurations (e.g. bedrock attitude) in catchment connectivity and sediment transport is rarely considered. We examine four young (<100-year-old) active tributary junction alluvial fan systems from the Dadès Valley in the High Atlas of Morocco in terms of their catchment-scale connectivity, sediment transfer and resulting alluvial fan processes. The catchments occur on the same lithologies (limestones and interbedded mudstones), but experience different passive structural configurations (tilted and structurally thickened beds). The fan systems react differently to historical peak discharges (20–172 m 3 s −1 ). Catchments containing tectonically thickened limestone units develop slot canyons, which compartmentalize the catchment by acting as barriers to sediment transfer, encouraging lower sediment to water flows on the fans. Syn-dip catchments boost connectivity and sediment delivery from translational bedrock landslides as a result of steep channel gradients, encouraging higher sediment to water flows. By contrast, translational landslides in strike-oriented drainages disrupt longitudinal connectivity by constricting the valley width, while the gradients of the main channels are supressed by the attitude of the limestone beds, encouraging localized backfilling. This diminishes the sediment to water content of the resulting flows.