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.
Initial capture image overlaid on recapture image of Nautilus #274 showing 2 ½ years of circumferential growth at a rate of 0.61 mm / day. The shock-line of initial capture can be seen on the recapture image and provides an easy method to check growth measurements.
