An official website of the United States government
Here's how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Latest Earthquakes | Chat Share
The USGS-St. Petersburg Carbon Analytical Laboratory utilizes state of the art methods and instrumentation for quantifying carbon system parameters in aqueous samples.