Where is tyndall manitoba

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The colour difference between mottle and surrounding rock reflects a fundamental compositional difference. Mottles are mostly composed of finely crystalline dolomite CaMg CO 3 2 , whereas the surrounding rock is mostly limestone composed of the mineral calcite CaCO 3.

The mineralogical difference is nicely expressed in naturally-weathered outcrops where the darker, dolomitic mottles are slightly more resistant than the surrounding, calcitic, lighter-coloured rock. Clearly, during the post-depositional alteration 'diagenesis' of the sediment, the burrow-fill sediment and the burrowed sediment behaved quite differently.

One became dolomite, the other limestone. Burrowing must have occurred while the sediment was still relatively soft.

The excavation made by the burrower would have been subsequently filled with sediment, either backfilled by the burrower, or piped-in after the burrow was abandoned. Thus, there developed a very slight porosity and permeability difference between the burrow fill and surrounding sediment, perhaps as a result of differences in particle size or sorting.

In addition, there may have been slight differences in the amount of organic material incorporated in the burrow fill, maybe even from the burrower's fecal pellets, and the sediment hosting the burrow. Accepting that the burrow-fill and surrounding sediment were compositionally different, even if only to a very minor extent, this difference was evidently adequate to allow the sediment hosting the burrows to become partially lithified calcite-cemented while it was still just below shallow sea floor.

In contrast, the burrow-fill sediment remained relatively unlithified - in fact, some of the burrows are themselves burrowed by a younger and smaller generation of burrowers, testifying to the hardness contrast between the softer burrow-fill and surrounding, stiffer, partially lithified sediment. This younger generation of burrowers may have been seeking organic matter preferentially concentrated in the older burrows.

Continued burial slowly transformed the burrowed sediment into rock. At a later stage in the burial history of the Tyndall Stone, perhaps when the evaporitic sediments of the overlying Fort Garry Member of the Red River Formation were being deposited, magnesium-rich brines infiltrated preferentially into the burrows because this part of the rock was still relatively permeable compared to the surrounding more lithified and less permeable rock.

Dolomite was preferentially precipitated within the burrows, replacing the original calcareous sediment. The darker colour of the mottles could be the result of the oxidation of some of the iron that forms a trace constituent within the dolomite, or it might have resulted from the oxidation of dispersed pyrite FeS 2 that precipitated along with dolomite within the mottles.

The quarried bedrock at Garson is overlain by a relatively thin mantle up to 4 m of Quaternary stony till. Once this overburden is removed, a combination of giant circular 8 foot-diameter diamond-tipped saw blades, wedging and drilling yield large blocks of rock that are then carried by front-end loaders to the processing plant.

Here the blocks are further cut into the desired proportions using various diamond-tipped saws and finished using an array of grinding, impact and splitting methods to impart the final surface texture.

Specially equipped trucks deliver the final product to the building site. Tyndall Stone is typically marketed under two broad classifications: 'cut stone', also know as 'dimension stone', which is cut and shaped to specific dimensions from architectural drawings, and 'random ashlar' which are pre-cut stone strips cut into various standard sizes or 'uncoursed' pieces of rock of random size.

These are laid in mortar in a linear or irregular pattern. Tyndall Stone is quite legitimately marketed as an aesthetically pleasing, low-maintenance 'natural product' characterized by structural strength, durability, fire resistance, and sound deadening qualities.

The rock is also extremely versatile, being equally at home in an urban setting as in a rural one, and in traditional as well as in contemporary residential and commercial architecture. Gillis Quarries has available a series of brochures that illustrate numerous, well-photographed examples of houses, apartments, condominiums, office buildings, universities, museums, hospitals, banks and churches that prominently demonstrate the natural beauty of Tyndall Stone. Part of the versatility of using Tyndall Stone comes from the wide range of finishes which are possible.

The 'rubbed' or machined-smooth face is the most typical, and is the surface which most clearly shows the beautiful mottling effect. Some surfaces are processed to deliberately preserve the circular saw marks, whereas others are modified by sand blasting. Ashlar facings are often produced with 'split-finish', which is achieved by splitting the stone with powerful hydraulic shears.

The resulting surface shows the colour mottling but also exhibits irregular shadow effects and texture from the artificially produced fracture surface. Most stone is produced in a standard grade, but a 'select' grade is available for certain applications where fossils or other natural markings are needed.

In addition to product brochures you can read more about Tyndall Stone and its extraction and processing, as well as view examples of spectacular projects using this rock, in the Gillis Quarries Limited web site. Tyndall stone is as scientifically interesting as it is beautiful! The next time you see your favourite politician facing a scrum of eager reporters in the Parliament Buildings, turn down the volume, and enjoy the view! I would like to thank my colleagues, Dr.

Nancy Chow at the University of Manitoba, and Dr. Brian Pratt, at the University of Saskatchewan, for their help in reviewing and illustrating this article. Ekdale, A. Ichnology - trace fossils in sedimentology and stratigraphy. Friedman, G. Principles of sedimentary deposits. Maxwell Macmillan Canada, p. Goudge, M. Canadian limestones for building purposes. Canada Department of Mines. You always get the lowest price.

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