Tyndall stone

The mottling gives the rock a tapestry-like effect, and it is popular for use as a building and ornamental stone.

[1][2][3] Tyndall Stone is highly fossiliferous and the fossils contribute to its aesthetic appeal.

It contains numerous fossil gastropods, brachiopods, cephalopods, trilobites, corals, stromatoporoids, and others.

The mottling results from burrowing by marine creatures that occurred during and shortly after limestone deposition.

The Canadian Parliament Buildings in Ottawa, Ontario, the Saskatchewan Legislative Building in Regina, Saskatchewan, the University of Saskatchewan in Saskatoon, Saskatchewan, the Federal Public Building in Edmonton, Alberta, the Canadian Museum of History in Gatineau, Quebec, the Manitoba Legislative Building in Winnipeg, Manitoba, the Banff Springs Hotel,[5] the Empress Hotel in Victoria, British Columbia, les Apartements Le Chateau in Montreal, Quebec[6] and many others include Tyndall Stone in their construction.

This carved Tyndall Stone coat of arms on the University of Saskatchewan campus shows the stone's characteristic mottling.
Fossil Receptaculites and Thalassinoides in Tyndall Stone.