Amazing 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"x3/4" Margaretia Algae on a 3"x2" x 1/4" thick piece of 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 this nice dark-grey example found without iron staining and degradation making it much more rare.
The classification of fossilized Margaretia dorus have evolved through the years. This Cambrian fossil was originally thought to be a alcyonarian coral, later it was classified as Margaretia dorus, a green algae having approximately 10 cm fronds and covered with a range of parallel oval holes. More recently it has been classified as an organic tube holding a type of a worm called Oesia disjuncta, a hemichordate worm of the class Enteropneusta. We at The Bug House, maintain that Margaretia is an algae, and we find it far more plausible the fossil has shown an early example of symbiosis. Although excellent specimens of Margaretia found in the Wheeler Shale are a more rare find, of these rare finds, there have been an extreme few specimens, showing any indication of an association with a hemichordate worm.