I found it hiking near Lethbridge, Alberta years ago, just found it again while going through old boxes. The wavy lines look kind of organic, but I don’t know about the rest.
I found it hiking near Lethbridge, Alberta years ago, just found it again while going through old boxes. The wavy lines look kind of organic, but I don’t know about the rest.
The waves look very regular to me, maybe something like this? https://au.grandado.com/products/plastic-garden-edging-fence-border-green-corrugated-landscape-tidy-lawn-divider-prevent-overgrowth-of-grass-newest?variant=UHJvZHVjdFZhcmlhbnQ6ND
Not sure how multiple layers would break in a cross section. Maybe sediment plus freezing could make it brittle?