Figure 6.
Heat map of trace impurity elements (mg/kg) in the biodeposits on the surface of the different rocks (1 mg/kg = 10−5 wt%).
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.