Figure 5.
Average sill thicknesses in individual boreholes sorted according to the age of the enclosing sedimentary strata and the regional division from figure 2. (Online version in colour.)
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.