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Red River Floodway, Winnipeg, Manitoba, Canadai
Regional Level Types
Red River Floodway- not defined -
Winnipeg- not defined -

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Latitude & Longitude (WGS84):
49° 49' 44'' North , 96° 57' 12'' West
Latitude & Longitude (decimal):
Nearest Settlements:
Winnipeg632,063 (2013)15.2km
Niverville2,000 (2008)25.6km
Headingley3,215 (2013)33.1km
Selkirk9,653 (2008)35.3km
Steinbach9,607 (2008)38.8km

Floater Gypsum crystal clusters occur in Pleistocene Age Lake Agassiz clay. The distribution of the Gypsum covers a 20 kilometer wide area but the Floodway is one of the few excavations in the very flat terrain deep enough to intersect the Gypsum layer.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

1 valid mineral.

Detailed Mineral List:

Formula: CaSO4 · 2H2O
Reference: Rock Currier; Matile, G.L.D., Betcher, R.N. 1998. Observations on selenite distribution within the Lake Agassiz clay plain, Manitoba Energy and Mines, Geological Services, Open File Report 98-6, 6 p.
Gypsum var: Selenite
Formula: CaSO4 · 2H2O
Reference: Mr. António Manuel Ináçio Martins.; Mineralogical Record 22:384-5; Matile, G.L.D., Betcher, R.N. 1998. Observations on selenite distribution within the Lake Agassiz clay plain, Manitoba Energy and Mines, Geological Services, Open File Report 98-6, 6 p.

List of minerals arranged by Strunz 10th Edition classification

Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Gypsum7.CD.40CaSO4 · 2H2O
var: Selenite7.CD.40CaSO4 · 2H2O

List of minerals arranged by Dana 8th Edition classification

Gypsum29.6.3.1CaSO4 · 2H2O
Unclassified Minerals, Mixtures, etc.
var: Selenite-CaSO4 · 2H2O

List of minerals for each chemical element

H Gypsum (var: Selenite)CaSO4 · 2H2O
H GypsumCaSO4 · 2H2O
O Gypsum (var: Selenite)CaSO4 · 2H2O
O GypsumCaSO4 · 2H2O
S Gypsum (var: Selenite)CaSO4 · 2H2O
S GypsumCaSO4 · 2H2O
Ca Gypsum (var: Selenite)CaSO4 · 2H2O
Ca GypsumCaSO4 · 2H2O

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Late Ordovician
443.8 - 458.4 Ma

ID: 3186028
Paleozoic sedimentary rocks

Age: Late Ordovician (443.8 - 458.4 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Late Ordovician
443.8 - 458.4 Ma

ID: 1298218
Red River Formation

Age: Late Ordovician (443.8 - 458.4 Ma)

Stratigraphic Name: Red River Formation

Description: Limestone, dolomitic limestone, dolomite

Comments: Western Canada Sedimentary Basin

Lithology: Limestone, dolomite

Reference: Manitoba Mineral Resources. Bedrock geology, Manitoba; in Map Gallery – Geoscientific Maps, Manitoba Mineral Resources (July 2015). [10]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


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Matile, G.L.D., Betcher, R.N. 1998. Observations on selenite distribution within the Lake Agassiz clay plain, Manitoba Energy and Mines, Geological Services, Open File Report 98-6, 6 p.

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