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Sedimentary rocks > Deposition in continental environments > Flashcards

Deposition in continental environments Flashcards

1
Q

Rocks in glacial environments? x5

A

till/ boulder clay
breccia/ conglomerate
sandstones

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2
Q

Sandstone characteristics in a glacial environment? x4

A

poorly sorted
coarse
angular
immature and varied

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3
Q

Sedimentary structures in glacial environments?

A

cross bedding in sandstones

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4
Q

Features in glacial environments?

A

striations on underlying rock

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5
Q

Processes in glacial environments?

A

sandstones deposited by melt water streams

till/ boulder clay and breccia/ conglomerate - ice melting, deposition in situ, moraines

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6
Q

Rocks in fluvial environments? x6

A

conglomerate
arkose/ grit
sandstone
clay and silt

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7
Q

Sandstone characteristics in fluvial environments? x5

A 
moderately sorted
medium
sub angular to sub rounded
immature (arkose)
varied
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8
Q

Sedimentary structures in fluvial environments? x3

A

cross bedding
asymmetric ripples
imbricate structure

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9
Q

Fossils in fluvial environments?

A

rare plants

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10
Q

Processes in fluvial environments? x3

A

alluvial fans
river channel meanders- point bars
flood plains

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11
Q

Features in fluvial environments? x3

A

channels in conglomerates

cross cutting and fining up sequence in sandstone, clay and silt

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12
Q

Rocks found in a hot desert? x5

A 
wadi conglomerates
alluvial fan
arkose
Aeolian sandstone
play lake evaporites
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13
Q

Sandstone characteristics in a hot desert? x5

A 
very well sorted
medium
well rounded
mature -quartz
frosted clasts
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14
Q

Sedimentary structures in a hot desert? x4

A

large scale dune cross bedding
asymmetric ripples
desiccation cracks
salt pseudomorphs

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15
Q

Fossils in a hot desert?

A

rare trace fossils

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16
Q

Processes in hot desert? x3

A

wadi conglomerates- torrential flash floods fill valleys

aeloian sandstones- dunes - barchans and seif

play lake evaporates- playa lake evaporation

17
Q

Features in a hot desert? x2

A

frosted grains

red iron oxide

18
Q

Rock found in deltaic environments? x5

A

coal
seat earth
sandstone
clay and shale

19
Q

Sandstone characteristics of deltaic environments?

A

cyclothem

20
Q

Sedimentary structures found in deltaic environments? x3

A

cross bedding
root marks
burrows

21
Q

fossils in deltaic environments? x2

A

plants and bivalves

22
Q

processes in deltaic environments? x3

A

topsets- delta top swamps
forest- delta front
bottomset- marine clay

23
Q

features found in deltaic environments? x3

A

coarsening up
cyclothem
channels- lateral variation

Sedimentary rocks (8 decks)

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