Upper and Lower Cow Lake were formed when tube-fed outflow from Coffeepot Crater dammed ancestral Cow Creek. (Courtesy Google Earth Pro and W.K. Hart, January 2019)

Area illustrates remnant cone and crater, southwest fissure with associated pahoehoe flows and spatter cones, northwest-directed ejecta field from late-stage minor explosive activity, lava channels and levees formed in fluid pahoehoe flows derived from episodes of lava pond overflow, and ovoid features formed by collapse of one or more levels of lava tube system to form pit craters. (Courtesy Google Earth Pro and W.K. Hart, January 2019)

Fisheye view of Coffeepot Crater with remnants of original cone walls (higher areas on left and right), stacked thin pahoehoe sheets filling southeastern area of original crater wall that was rafted away during lava pond high stand, main south-southeast outflow field, and pahoehoe crust on floor of crater from final solidification of receded lava pond. (Courtesy Jacob A. Selander, 2017)

Prominent high forming crater rim on right side is portion of original cone wall. (Courtesy William K. Hart, 2019)

Portion of original crater wall illustrating wavy vertical striations carved by solidified crust of rising and falling lava pond and remnants of frothy lava veneer left behind by receding lava. Then Ph.D. student, now Professor Kurt Shoemaker (Shawnee State University) for scale. (Courtesy William K. Hart, 2019)

A glimpse at the nature of pahoehoe illustrating smooth, hummocky, and ropy aspects, as well as nicely developed lava toes/lobes. High point in upper left is an up-domed area of solidifying lava crust that was inflated by continued input of hot material in the underlying tube system, with some of that material squeezing out and flowing short distances away from what is referred to as a tumulus. Brown handled rock hammer in center-right for scale. (Courtesy William K. Hart, 2019)

View to the northwest over a portion of the main Jordan Craters pahoehoe flow field from a high point adjacent to the prominent, irregular terminus of the field where it onlaps an approximately 200,000 year old lava flow. Note Coffeepot Crater area in upper right of image, approximately 7 miles distant. (Courtesy William K. Hart, 2019)

Pahoehoe surface illustrating classic ropy texture. Rock hammer in center for scale. (Courtesy William K. Hart, 2019)

(Courtesy William K. Hart, 2019)

(Courtesy Oregon Hist. Soc. Research Lib., 981d132)

(Courtesy Bureau of Land Management)

(Courtesy Bureau of Land Management)

(Courtesy Bureau of Land Management)