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.
Comparison of bulk rock and fossil oxygen-isotope data. (A) Data from North American samples, colored by location as in Fig. 1. Circles denote bulk rock, triangles denote brachiopod samples (22), and outlined circles denote from clumped-isotope samples (20). (B) Global data. Black circles are bulk rock, red triangles are brachiopod (22), and orange circles denote from clumped-isotope samples (20).
