Over 2200 feet and another interesting contact

Today we processed rock core to a depth of 2158 ft, and this evening's delivery of core runs just beyond 2200 ft.  We saw some interesting features in the rock for sure, hopefully I'll be able to take photos of those features soon...but first, here's another example of an intriguing baked soil contact between pahoehoe flows:

Note that the clasts within the baked region are angular, have diverse lithologies, show no particular sorting with depth, and do not resemble the lava rock above or below.  I can also inform you that the baked region is quite solid and cohesive, probably the result of being welded together by baking and/or compaction by all the feet of rock that was recently on top of it.  One possible origin for this layer of conglomerate is glacial outwash, though as I mentioned yesterday we can't be sure of that without knowing more information.  I'm currently reading up on the glacial history of Mauna Kea to better understand and interpret features like this.