science Rock Cycle - When picking rocks for hardscapes use Metamorphic rock, especially with water (so it doesn't leach anything into water) also important to know what type of rockscape animals may have evolved in.
pinner:: Large and Rare Precious Ammolite - Ammolite is opalized organic matter created from squid like creatures from the Cretaceous era, over 45 million years ago. In exhibit at the Natural History Museum in NYC.
Ammonites went extinct with Dinosaurs 65 million years ago. Ammonites survived until the end of the Cretaceous period in a sea that covered what is now Alberta. Canada and Montana, USA. These ammonites were transformed into the rare gem known as Ammolite.