For images of active pahoehoe flows, click here or here . This is an overview picture of McCartys flow front with Joe in the picture for scale. The McCartys flow is approximately 3,000 years old, and is mainly composed of pahoehoe lava. The height of the ridge is approximately 15' to 20'. The high area in the middle of the view is the edge of pressure ridge with a large central fissure.
Local vegetation is salt bush.
This photo shows the edge of the McCartys flow. For image of actively flowing pahoehoe, click here . This may be related to oxidation of iron within the flow, or to oxidation of windblown dust that accumulated in the flow after eruption. In some places, the glassy crust display bluish sheen - phenocrysts are not visible with naked eye. Olivine, pyroxene, and plagioclase are likely to be present.