Fossilized Margaretia dorus Cambrian AlgaeExcellent example of an authentic fossilized algae specimen Margaretia dorus found in Utah. Age: Middle Cambrian (521 to 497 mya) Species Name: Margaretia dorus Locality: Wheeler Shale, Millard County, Utah Size: Approximately 5 1 2" x 5" shale piece with both specimens 2" x 7 8" 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