Minnesota Rock
Column Diagram
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This 11 X 30 inch large format diagram is a must-have visual aid. It's printed on 4 letter-size
sheets and comes in a 3-ring page protector for convenient media management.
The special price of $4.50 includes S&H, with 3-day delivery.
Order Form
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Companion Samplers
Interactive Sand Sampler
A trio of Minnesota sands lend their beauty, mystery, and variability from a cross section of the Minnesota rock column. Compare, contrast, analyze, and infer with this intriguing interactive sampler. Quantity discounts are available, which makes this an invaluable classroom extension or a unique promotional item.
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Surficial Geology Sampler
Literally at the top of the heap, this budget-minded sampler has all the essentials. It's a sextet of tills you'll find most titillating. Explore the lithologic characters: sand, silt, and clay ratio as well as the crystalline, carbonate, and shale ratio. Again, quantity discounts are available, which makes this another invaluable classroom extension or a unique promotional item.
Order Form
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Field Guide Album
Complement the Minnesota Geologic Column display with this pictorial collection of Minnesota rocks, minerals, and fossils. Twelve 4 X 6 photographs capture the details of representative rock specimen that span the geologic rock column. The fifteen page album offers convenient media management, and has ample room for a growing pictographic geologic library.
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Much of Minnesota's rock record is buried beneath a thick cover of glacial sediment.
See the Minnesota Surficial Geology Collection.
A fresh exposure of till, deposited during the Quaternary, is clearly visible in this photograph of a land slump along a Minnesota highway. The yellow-brown color suggests the source area may be Manitoba, North Dakota, and western Minnesota.
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The Cedar Valley Limestone and Dolomite, Devonian in age.
See the List of Specimens
Many of the old barn foundations in the southeastern region of the state are constructed with limestone and dolostone. It’s fun to look for fossils in the foundation stone.
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Decorah Shale contact with the underlaying Platteville formation.
See the Minnesota & More Fossil Collection.
Deposited during Ordovician Period, the Decorah Shale is fossil-rich, while the Platteville Limestone yields the occasional larger cephalopod.
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Chimney Rock with the Platteville Limestone on top and the St. Peter Sandstone below is of the Ordovician Period.
See the Minnesota River Valley Collection
Here is a link to a newspaper article that concerns this interesting topographic land feature: Pillar of the Past. OOPS! Looks like the newspaper archived this file, so they want you to pay them to retrieve it. Sorry.
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Undisclosed site of the 'Great Unconformity' with Mt. Simon Sandstone.
See the List of Specimens for a sample.
Mt. Simon Sandstone stretches from Minnesota to Texas. In Missouri it's referred to as the LaMatt (sp) Formation. It contains imbedded quartz pebbles (quartz conglomerate) with occasional fossils.
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Hinckley Sandstone of the late Precambrian.
See the Pine County Collection.
Exhibits bedding and crossbedding features.
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Pillowed Ely Greenstone. Early Precambrian in age.
See the Cook County, Gunflint Trail Collection
The rock’s green color is due to the presence of the minerals chlorite, epidote, and actinolite.
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since February, 2007.