field trip quiz 323

3 main geomorphic developments

• flat glacial lake basin and till plains (Regina)

• rolling hills of glacial deposit

• large glacially spillway, underfit review (quappelle)

landscape is a product of what

glaciation

• modern processes (fluvial erosion, mass movement, soil erosion) reworking GLACIAL materials. Lands use to be managed

Wascana Lake main concepts

• regina low

• glacial lake regina

• floods

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Regina low

• bedrock controlled lowlands that became a depositional basin

• collapse structure- bedrock deformed by dissolution of underlying evaporites (devonian salts)

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glcaial lake regina

• large progracial lake that occupied regia low

• floor is now flat regina plain

• fine particles settles out to make clau

flooding near regina

• lake floor topography has poor draiange

• lake basin alow gradients

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glcail lake Regina clay

• montmorillonite (shrink swell clay)

• leads to cracks in sidewalks roads and foundations

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zehner key concepts

moraine, soils and sediments, aquifers

zehner moraine

• hummocky till

• knob and kettle

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humoocy till

• product of dead ice melting in place

• laurentide ice sheets melted and left knob and kettle topography

• why Zehner is rolling and Regina is flat

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ice walked lake plains

• prominent in hummocky areas

• lakes were maee between ice walls, fine sediment settles in them

• when melt, flat plain will sloughs is left

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zehnrer soils

• till and glaciolacustrine materials

• dark chermozemic soils

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wascana trails south keey concepts

landscape development

stratigraphy

mass movement

gully erosion

wasnca valley landscape developmetn

meltwater channel/ spillway cut into till and bedrock

wascana valley stratigahpy

exposed sections show till, glaciolacustrine sediment, colluvium

wascana valley mass movement

• valley slopes - composed of weak till + clay

• fail by slumping, sliding, snd creeping

• expansive clay causes instability

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gully erosion

weak unconsolidated sediment + sparse vegiation + intense summer stoerms

• makes gullies from concentrated runoff

rill erosion

small shallow channels cute by sheet flow concentrating into lines

wascana trails floodplain key concepts

fluvial erosion. depositions, underfit strream

misfit/ underfit stream

• a river that is too small for its vallet

• valley was cut by larger flows ( glacial meltwater spillway) and modern river is filled in

quappelle valley formed by

glcail spillway

lumsepd pump stattuib kc

land use, flood control

pump station land use

agricultire on valley floor and terraces

punp stateuion does what

manages water levels/ flooding in the valley

mondern geomorophic processwes

rill erosion, gully erosion, mass movement, alluvial fan depotioson, lfooding