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Diatoms of the United States is now known as Diatoms of North America.
This site has been redesigned and updated, and will be closing soon.

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Questions? Concerns? Comments?

Please check the FAQ (Frequently Asked Questions) page first.

If you do not find an answer in the FAQ, contact Sarah Spaulding.  She will respond to you within a few days. If she can't help you directly, she will put you in touch with someone who can.

Sarah A. Spaulding

US Geological Survey / Institute of Arctic and Alpine Research
Campus Box 450

University of Colorado
Boulder CO 80309