I don't know... I guess I just couldn't learn to figure skate. Those are actual soil and mineral collections that occur when wind blows stuff in one time cracks and, for glaciers when two glaciers merge going down to the calving areas set aside for them. I'll dig up sone shots of glaciers fron the North Beagle Passage. There are tangential fiords along the passage and many many very large glaciers merging. The coloration of the glacial melt meeting the slat water is a terrific shearline example as well.