Then about 3 years later, it separated into two phases: one clay-rich and the other clay-poor.
The effect is most pronounced on granular (clay-poor) debris-flow lahars that typically have steep, boulder-laden flow fronts.
The composition of all four brick bodies is consistent with the silica-rich, clay-poor fired material similar to faience.
Clay-poor gouge samples likely experienced substantial grain-size reduction and compaction, resulting in slip hardening (e.g., Morrow and Byerlee 1989).
Two saprolite facies, one clay-rich and the other clay-poor overlie the saprock; the recognition is based on several criteria.
Sandy, clay-poor successions are highly quartz cemented (i.e., silica importers), whereas clay- and mica-rich successions are more compacted (i.e., silica balanced or silica exporters).
These clay-poor and organic-lean interbeds with coarser brittle minerals usually have better reservoir quality with higher porosity and permeability and are more conductive than shale allowing oil and gas to travel to the wellbore (Chalmers et al. 2012).
He added that the slower clay made poor shots "not as acceptable".
Unfortunately, the heavy clay soils, poor drainage and many streams made these routes frequently impassable in winter.
