These interesting, very early algal fossils are "Oncolites" which are algae colonies that form spheres or oval shapes as differentiated from "Stromatolites" which are algal colonies forming cylindrical or tube shapes.  The oncolites in this specimen are the dark black round and oval  features which measure in the range up to 1/2 inch  on the longest axis of the oval.  They are taxonomically identified as Girvanella sp.  The material comes from the Lower Cambrian Chambless Limestone Formation in San Bernardino County, California.  Age is approximately 550 million years ago.  The specimen measures approximately 4" x 2" and .75" thick.   

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