2 X GIRVANELLA - 1 polished & 1 rough large colonies of Lower Cambrian algae

Description

This auction is for a pair of specimens - one a polished slab and one a totally natural rough specimen.  We have observed in the past that our fossil algae collector friends like to show a polished specimen and a completely natural one side by side to show what the algae colonies look like in the strata.  Here's an opportunity to acquire two pieces - one polished slab and one piece of rough so that they can be displayed side by side.  This can be particularly useful for fixed displays in locked cases.
Check out our photos on this listing - we show the polished slab first followed by three closeups of colonies on the polished face and then we show the rough specimen followed by two closeups of colonies on the rough specimen.   The polished slab specimen measures a
pproximately 5" x 3"  and it is approximately 3/8" thick".  The rough specimen measures approximately 4" x 2" and is 1" thick.
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.  We recently acquired some old stock material that contains considerably larger oncolite colonies than the fossils we have had for several years.  These oncolites measure between a half and three quarters of an inch on the longest axis (11mm to 19mm).  In addition to their larger size, many of these colonies have been preserved with a bit of iron oxide in the mix which makes for an outstanding display specimen.  We were so impressed with the colorful nature of the fossil that we turned it over to our lapidary and the result is a polished end cut with cross sectioning of colonies on the cut and polished face and colonies weathering out on the all natural back side.  They are taxonomically identified as
Girvanella sp.
The material comes from the Lower Cambrian Chambliss Limestone Formation in San Bernardino County, California.  Some research on the internet suggests that these larger colonies may come from lower (older) strata of the Chambliss Fm.
We specialize in petrified wood and plant fossils which are accurately identified as to locality of origin and family, genus or species. We don’t guess and when we don’t know, we say so! Your specimen will come with a label identifying the specimen, the locality where it was collected, the formation and age of the material and any other pertinent information we have gleaned from our literature search.
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