conversely, a non biological interpretation has been put forward past experiments reproduced "arumberia"-like traces from flume experiments and from the flux of water around small objects. the absence of "arumberia"-like structures after the ediacaran period could be due to the unique properties of the microbial mat that covered the sea floor at the period. however, there is still debate, with recent analysis of urals' "arumberia"-like structures leaning towards a biological interpretation as an organism adapted to shallow water environments. the rugae of "arumberia" are considered to form from exclusively biological processes as observed in modern microbial mats and not from sediment desiccation, cracking or other abiotic processes. fine wisps of organic material have been observed in thin section of "arumberia" cut perpendicular to bedding planes, further suggesting that arumberia was a living organism.