Grand Sable Dunes, Pictured Rocks National Lakeshore, Alger County, Michigan, USAi
| Regional Level Types | |
|---|---|
| Grand Sable Dunes | - not defined - |
| Pictured Rocks National Lakeshore | - not defined - |
| Alger County | County |
| Michigan | State |
| USA | Country |
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Latitude & Longitude (WGS84):
46° 39' 24'' North , 86° 4' 23'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
298911
Long-form identifier:
mindat:1:2:298911:5
GUID (UUID V4):
d4439c34-6ba9-4ab5-b4f0-9cec37fe248c
The Grand Sable Dunes are located west of Grand Marais in Alger County, Michigan. Towering over 300 feet above the Lake Superior shoreline, the dunes cover a 5-mile stretch along the southern shore of Lake Superior in the eastern portion of the Pictured Rocks National Lakeshore.
The dunes are an example of what is known as a perched dune system, which are dunes formed atop an existing bluff (the Grand Sable Banks). The dunes were created during the last major ice advance/retreat event called the Marquette readvance. Major water level fluctuations in Lake Superior during this event resulted in significant erosion of glacial deposits, creating vast amounts of sand. It is thought that predominantly northwesterly winds picked up this sand and deposited it high on the Grand Sable Banks, thus creating the perched dunes we see today.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
1 valid mineral.
Detailed Mineral List:
| ⓘ Quartz Formula: SiO2 |
| ⓘ Quartz var. Agate |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz var. Agate | 4.DA.05 | SiO2 |
| ⓘ | 4.DA.05 | SiO2 | |
Other Regions, Features and Areas containing this locality
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References
Grand Sable Dunes, Pictured Rocks National Lakeshore, Alger County, Michigan, USA