Term
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Definition
1.DEPOSIT AT EDGE OF MOUNTAIN FRONT (OR GLACIER) WHOSE SURFACE FORMS A SEGMENT OF A CONE THAT RADIATES DOWNSLOPE FROM THE STREAM SOURCE
2. DECREASE IN STREAM GRADIENT AT FOOT OF MOUNTAIN & LOSS OF CONFINING CHANNEL RESULTS IN LOSS OF COMPETENCY OF STREAM, SO SEDIMENT IS DEPOSITED |
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Term
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Definition
HIGH DENSITY, HIGH VELOCITY FLOW
POORLY SORTED; 1-3 M THICK
LOBATE TONGUES EXTENDING FROM SHEETS
"OVERSIZE" CLASTS; STRUCTURELESS OR GRADED |
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Term
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Definition
"DEBRIS FLOW" THAT LACKS GRAVEL
<0.5 M THICK; POORLY SORTED; STRUCTURELESS |
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Term
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Definition
| TYPICAL BRAIDED STREAM DEPOSITS |
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Term
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Definition
THIN FLOW OF WATER <0.3 M THICK
SHEET-LIKE SAND &SILT (LITTLE CLAY)
PARALLEL LAMINATIONS; BEDS <0.3 M THICK |
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Term
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Definition
LOBES OF GRAVEL THAT ARE DEPOSITED WHEN WATER INFILTRATES POROUS SURFACE OF FAN
WELL-SORTED; 1-3 M THICK; CLASTS > 1 M
RARE; STRUCTURELESS; CHIEFLY ON UPPER FAN; LOBATE GEOMETRY |
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Term
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Definition
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Term
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Definition
Dunes = typical eolian stratification; possibly root traces & burrows
Storm beach = same as swash zone |
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Term
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Definition
1. Swash zone = parallel laminations dipping <10?seaward (= low angle cross-
beds)
2. Sand waves or dunes = trough and tabular cross-beds |
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Term
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Definition
| current ripples & wave ripples & cross laminations formed from them; minor bioturbation |
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Term
| microtidal TRANSITION ZONE |
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Definition
mud interlaminated with rippled or laminated sand; more
bioturbation than shoreface |
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Term
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Definition
| is a geological term used to describe particles of rock derived from pre-existing rock through processes of weathering and erosion. Detrital particles can consist of lithic fragments (particles of recogniseable rock), or of monomineralic fragments (mineral grains). These particles are often transported through sedimentary processes into depositional systems such as riverbeds, lakes or the ocean forming sedimentary successions. Diagenetic processes can transform these sediments into rock through cementation and lithification, forming sedimentary rocks such as sandstone. These rocks can then in turn again be weathered |
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