Great progress, a change of rock type

Last night and today, the drillers have really gone a long way.  We got a huge delivery of core this morning, and processed it to a depth of 335 ft.  Up at the drill site, they are at least 50 feet deeper than that at the time of this blog post.  Below is a picture of an interesting transition that we saw while processing the rocks today:

Remember in yesterday's update that all we were seeing was loose cinder?  Well we saw lots more of that...until this contact.  Note that the oxidized cinder on the left holds together in a coherent manner, which was surprising on its own.  In addition, the contact between cinder and nonvesicular rock beneath it is extremely sharp, a change so sudden that you could hardly get two more physically different rock types next to each other in such a setting.  We will have to carefully consider the meaning of this contact when logging both rock units later.