Mawsonia
madaginia Stromatolites
Geologic
Time: Early Cambrian, (~415 million years ago)
Size (25.4mm=1
inch): 90 mm by 95 mm by 42 mm thick (maximum)
Fossil Site:
Antrim Basalt, Northern Territory, Australia
Fossil Code:
AS14005
Price: Sold
 Description:
A polished section of what is termed a “plume stromatolite”,
this specimen comes from the Antrim Basalt region of the Northern
Territory of Australia. The intrusion of basalt into the region
in the Early Cambrian covered an area of some 300,000 km2 . It
is similar to deposits found on the other side of the planet
in County Antrim, Ireland, but far older. Stromatolites are remnants
of the most ancient of colonial organisms. Stromatolites are
fossils that are the result of the work of simple blue-green “algae” or
Cyanophytes, which lived in chains or mats covered in a jellylike
substance. By taking in carbon dioxide as a food source, they
precipitate limy deposits on the jelly that builds up in layers.
Thus these organisms build up stony supports for their colonies.
These mound like structures can be anywhere from several centimeters
to several meters in height. This one is quite natural in appearance
on all but the surface which has been given a high polish to
show off the myriad of colors. Notice the agatized pockets that
highlight the piece, as well as several columnal cross sections
of the colonies. While this piece would make a fine present for
any natural history buff, anyone who appreciates art would also
be glad to get thIs wonderful specimen as a gift.
Also
see: Stromatolites |
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