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.
Petrified Forest National Park is a globally significant exposure of fossils from the Triassic Period more than 200 million years ago. The paleontological and stratigraphic information exposed on park land is an invaluable source for the study of these ancient organisms and their environment.he most fertile soils within Petrified Forest National Park are generally found in the rolling grasslands, which are often located between mesas and badlands, as well as on a few of the mesa tops. These soils are composed of alluvial and wind-blown sands, making the soils quite permeable.