Schurs Paleontology



            Cambrian
            Fossils in the Bright
            Angel Shale

            of
            Northern Arizona

            Trilobite
            Pygidiums Fossils Section

            SH
            Locality near Ashfork, Az.

             
The primary trilobite at the SH Locality is
Zacanthoides Walapai.  Pygidiums here are internal
or external molds in a green glauconitic shale.

Updated 7/23/17
 
            The most common
            fossil found in the green shales at our SH locality are trilobite
            pygidiums for the Zacanthoides Walapai species. They are joined
            by assorted cranidiums, thorax and rib segments, and hordes of
            hyolithids, and a very rare coralomorph. Generally low diversity
            such as this site suggests has been attributed to a stressed
            enviorment, with perhaps low food sources, agressive wave action,
            or an influx of fresh water from the nearby deltas. This was
            a shallow sea outbound from the deposits known as the Tapeats
            Sandstone which marked shore, delta and beach deposits. Combined
            with the deeper water Muav Limestone, this trio of formations
            is known as the Tonto Group. All three can be found outside the
            Grand Canyon to the south in small limited areas such as here,
            yeilding an opportunity to explore the paleo fauna without hiking
            miles and thousands of feet into the Grand Canyon.

            
Collecting at the SH Locality!
The greenish shales are in thin beds, with a reddish
surface weathering.


Key Pygidum Diagram:
 

            
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            Component Key to pygidium features for Zacanthoides Walapai.  
Most pygidiums are 1/4 - 1/2 inches in size, and the state of
preservation varies.


Pygdium Images - Web cam close ups:
 

            
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Microscope Images - 10x:
 

            
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Paleo HOME
Cambrian Fossils in the Bright Angel Shale

of Northern Arizona

Trilobite Pygidiums Fossils Section

SH Locality near Ashfork, Az.
