RARE Mazon Creek Arachnid Architarbus

Architarbus rotundatus

Phylum Arthropoda, Subphylum Chelicerata, Class Arachnida, Order Phalangiotarbida, Family Phalangiotarbidae

Geological Time: Carboniferous, Westphalian Stage

Size (25.4 mm = 1 inch): Arachnid fossil 10 mm by 7 mm on a 30 mm by 25 mm nodule pair

Fossil Site: Mazon Creek, Francis Creek Shale, Braidwood, Illinois

Code: HMC03

Price: $1250.00


ArchitarbusDescription: The Mazon Creek deposits of the region near Braidwood, Illinois rival the other famous Lagerstatten of the Burgess Shale, Solnhofen, and Liaoning for the variety of detailed life preserved. Many exquisitely-preserved specimens are found in the ironstone nodules that make up the deposits. This fine specimen was found recently in Mazon Creek itself, and is of a spider-like arachnid known as Architarbus. The Mazon Creek location has yielded some 250 arachnids as of the publication of Richardson’s guidebook, more than any other Paleozoic locality. While most are incomplete, the degree of preservation allows for interpretation of these ancestral creatures. Note that there are several preserved limbs, and the finely segmented abdomen is quite evident in this part/counterpart specimen. I have recently been able to procure specimens from a family who has been collecting this material in the field for three generations, and will continue posting material as it becomes available to me.

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