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WikiProject Geology (Rated Start-class, Mid-importance)
WikiProject icon Ooid is part of WikiProject Geology, an attempt at creating a standardized, informative, comprehensive and easy-to-use geology resource. If you would like to participate, you can choose to edit this article, or visit the project page for more information.
Start-Class article Start  This article has been rated as Start-Class on the project's quality scale.
 Mid  This article has been rated as Mid-importance on the project's importance scale.

This article needs references. Also the section on formation suggests a causal relationship between Sr concentration of water and mineral type (aragonite vs calcite). Is that really true? --Armenite (talk) 01:53, 8 April 2011 (UTC)