Fossilized Margaretia dorus Cambrian AlgaeExcellent example of an authentic fossilized algae specimen Margaretia dorus. Age: Middle Cambrian (521 to 497 mya) Species Name: Margaretia dorus Locality: Wheeler Shale, Millard County, Utah Size: Approximately 2 1 4"x1 2" Margaretia Algae on a 2 1 2"x2" shale Comes with stand Most collected Margaretia are not this detailed and have an orange red coloration due to high iron content which most often causes a lack of clear distinct patterning as in