Hordes of Zacanthoides

            
Cambrian
            Fossils in the

            
Bright
            Angel Shale

            
of
            Northern Arizona

            
(Outside
            the Grand Canyon)

            

Hyolithid with operculum

Updated 8/13/17
 
Of about
            half a dozen isolated outcrops located about 50 miles south of
            the Grand Canyon that we explored, two of them were richly fossiliferous.
            The first site - The "SW" locality contained an abundant
            but low diversity collection of fossils in the green shales.
            A nearby hill graded from green shale at the base, to grey Muav
            Limesone, and this was found only to contain a few trace fossils.
            The second locality, here designated as the "IH" Locality
            was an isolated ridge out in the middle of nowhere that had a
            basal Tapeats Sandstone bed loaded with Lower Middle Cambrian
            trace fossils, overlain by a brown and grey sequence of shales.
            The top of the ridge was limestone beds that were literally made
            of trilobite hash. Finally a cap rock of a darker dolomitic mudstone
            preserved the ridge from erosion over the millenia.
 

            
 Sections of this Atlas:
The "SW" Locality
1.  General images of site and Key Fossils
3.  Fossil Groups
4.  Trilobite Thorax/Ribs
5.  Trilobite Cephalons/Cranidiums/hypostomes
6.  Trilobite Pygidiums
7.  Hyolithids
8.  Trace Fossils
9.  Coralomorphs

The "IH" Locality
1.  General images of site and Key Fossils
3. Trilobite Groups
4.  Trilobite Thorax/Ribs
5.  Trilobite Cephalons/Cranidiums
6.  Brachiopods
7.  Hyolithids
8. Trace Fossils
9. Problematica

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