These are sharkfin barrels used as drag scarifiers!
From BC (CANADA) Forestry Publication:
“Drag scarification is used primarily on lodgepole pine sites to create seedbed, distribute cones, and provide conditions for cone opening. Exposed mineral soil provides a suitable seedbed for the survival of germinants. Drag scarifiers are most suitable when slash is light and stumps are low.
There are two basic types of drag equipment: anchor chains with tines welded across the links, and drums with “fins” welded spirally along the surface (sharkfin barrels). These may be used separately or together to achieve certain objectives. Sharkfin barrels are heavier than the anchor chains and are used on sites where brush, slash, and depth of humus render the lighter anchor chains unsatisfactory. The drums do not move as freely as the anchor chains and therefore tend to produce limited seedbed or planting sites as opposed to the random mixing and exposure achieved with the anchor chains.”
Pretty cool!
