The reference paper says that the Makaopuhi lava lake is 1600 feet wide and 225 feet thick. It is overlain by 50 feet of younger lava flows. The field collector number is the depth or distance from the top (in feet) of the sample (minus the 50 feet of overlain new material). MP-247 = 197 feet from the top
File with data is housed with samples in the Petrology Collection. Also includes a box with index cards and information and slides.