Llano River Gravel - Authentic Central Texas Minerals for Rock Tumbling, Jewelry Making & Collecting - 16 oz Bag

The Paleozoic Era is a geological era that started 542 mya and finished 252.2 mya, encompassing the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian geological periods. It is marked in the beginning by the emergence of soft shelled life, and near the end of the Era, marked by complex plants (first modern ones), insects, fish and small reptiles.The Cambrian (from Cambria, the classical name for Wales) was a geologic period of time that lasted from 542 to 488 million years ago. It was the first period of the Paleozoic era, and is distinguished from the preceding Pre-Cambrian period by a spectacular increase in the number of living organisms; specifically, the emergence of multicellular life that possessed hard exoskeletons, and the divergence of many modern phyla like Mollusca, Echinodermata and, notably, Chordata, which of course is the phylum that contains all vertebrate life. This mixed Llano River "Gravel" bag weighs 16 oz. and averages over 100 pcs. A few of the images above show random specimens from this parcel grouped & "misted" with water to bring out some highlights. What you receive will be very much similar to what is shown. A Great learning item to inspect, rock tumble, use in crafts, form a beginning geology collection and More! A Limited item offered by Rockhound's 1st Choice From Central Texas. Refer to your Rock Tumbler's Instructions for polishing steps. WARNING-Choking hazard- Adult supervision suggested.

• Llano River "Gravel" - Authentic Central Texas Rocks & Minerals for Rock Tumbling, Study, Jewelry Making & Collecting - 16 oz Bag
• The Central Texas Llano Uplift area is known to have over 200 Different Minerals from the Precambrian, Paleozoic & Cretaceous Geologic Periods.
• Common minerals that you may be found in your 16 oz bag would be: schist, agate, mica, quartz, granite,chert,galena, celestite, fleldspar, serpentine, petrified wood, pyrite, hematite, flourite, gneiss & limestone.
• This mixed minerals bag is already partially "tumbled" by nature & is a great geology lesson with applications for further tumbling & polishing, study, jewelry making and collecting.
• Your Bag of Llano River "Gravel" will average over 100 pcs that will range in size from "pea" size, to "quarter" size, approximately 1/4" to 1" dia. Ready for final stages of polishing in your rock tumbler or for geology study investigation.