Slow Heart Beat (Bradycardia) An abnormally slow sinus heart rate is called the âsick sinus syndromeâ and, if severe, results in symptoms of fatigue. In some such cases a permanent pacemaker is needed to be implanted to generate a normal heart rate. Many people with sick sinus syndrome also develop atrial fibrillation.
Petrified wood (from the Greek root petro meaning rock or stone; literally wood turned into stone) is the name given to a special type of fossilized remains of terrestrial vegetation. It is the result of a tree or tree-like plants having completely transitioned to stone by the process of permineralization.lements such as manganese, iron, and copper in the water/mud during the petrification process give petrified wood a variety of color ranges. Pure quartz crystals are colorless, but when contaminants are added to the process the crystals take on a yellow, red, or other tint.
The Rock &Gem magazine, August 2010 issue, had an article about collecting at the DoBell Ranch which was in the Holbrook area. We drove east from Holbrook to the northern entrance to the Petrified Forest National Park. At the entrance I was asked by the attendant if I had any petrified wood.he original wood had been buried in the long ago past and the wood was replaced by silica with trace minerals. Those trace minerals produced the rainbow of colors that are displayed in the petrified wood. It is amazing to look at the end of a petrified log two foot in diameter and view the various color showing.