À¶Ý®ÊÓƵ

µþ²â:ÌýEd Freeman, Toronto

Paul Karrow, 
Quaternary Sciences Institute,
University of À¶Ý®ÊÓƵ,
À¶Ý®ÊÓƵ, Ontario,
N2L 3G1
Publication QSI PFK 11

But this bar is dry! Yessir, you'll get mighty thirsty looking for a drink at this bar! When I tell you this bar is actually an old beach, you needn't run to get your bathing suit either, `cause the water's long gone!

µþ²â:ÌýPaul Karrow

µþ²â:ÌýPaul Karrow, 
Quaternary Sciences Institute,
University of À¶Ý®ÊÓƵ,
À¶Ý®ÊÓƵ, Ontario,
N2L 3G1
Publication QSI PFK 12

µþ²â:ÌýJason M. Payne

µþ²â:ÌýJoe Hannibal, Cleveland Museum of Natural History

µþ²â:ÌýKelly Snyder and Peter Russell

Calcite

A mineral consisting largely of calcium carbonate (CaCO₃ ). Next to quartz, it is the most abundant of the Earth's minerals. Crystallizing in the hexagonal system, calcite is noted for its wide variety of crystalline forms.

µþ²â:ÌýMario Coniglio

µþ²â:ÌýXanxin Wang, Ph.D., 
China University of Geosciences (Wuhan)
Visiting professor at the University of À¶Ý®ÊÓƵ (1998-1999)

The element fluorine, ranking thirteenth in abundance in the Earth's Crust, is used by higher life forms in the structure of bones and teeth. The importance of fluoride in forming human teeth and the role of fluoride intake from drinking water in controlling the characteristics of tooth structure was recognized during the 1930s. Fluoridation of drinking water since then has been a common practice in many countries.

Peter Russell