This image shows the Bandelier Tuff in San Diego Canyon south of Jemez Springs, New Mexico, USA with its three members labeled. The La Cueva Member was erupted 1.85 million years ago (Ma), the Otowi Member 1.62 Ma, and the Tshirege Member 1.25 million years ago.
<a href="//commons.wikimedia.org/wiki/User:Kent_G._Budge" title="User:Kent G. Budge">Kent G. Budge</a>
<span class="int-own-work" lang="en">Own work</span>