Abstract
This paper researches and examines the relevant information available in relation to the Cambrian System of the Grand Canyon. The paper explains that the lower middle and upper series in the stratigraphic scale of the Cambrian is a duration of over 50 million years but the three faces of the Tonto group deposited simultaneously appear super and juxtaposed which could be explained due to a varying velocity of the water flow in the different zones while sedimentation was still in its formation process.

Outline
Objective
Introduction
The Cambrian System
Stratigraphy of the Grand Canyon
The Tonto Group Formations and Layers
Zones in the Tonto Group Strata
Summary

From the Paper
" The stratigraphy of the Grand Canyon is illustrated in the chart below: Precambrian sedimentological layer is a "complex group of highly metamorphic and intensively folded rock of the "Vishnu Group", inclusive of chlorite-mica schist, with minor amount of amphibolites, gneiss and calc-silicate rocks. Occurrences of Zoroaster pink feldspars granite is noted with intrusion of Vishnu rocks vertically and pegmatic veins that are as thick as multiples of ten meters. The Zoroaster and Vishnu rocks the compositional materials of the Lower Proterozoic. These rocks are laid over by tilted Upper Proterozoic volcanic0sedimentary Grand Canyon Supergroup in some tectonic depressions with the Tonto Group of the Cambrian System overlaying the Vishnu and the Zoroaster rocks. (Grand Canyon, 1989) "

Tags:vishnu, zoroaster, rocks

Abstract
This study discusses the Pre-Cambrian Period, roughly some two billion years ago, and in particular, fossils that have been found from that time period. The paper discusses three types of fossils that have been left behind -- body, trace and chemical and that these can be readily found within rocks formed during the Archaean and Proterozoic Periods.

From the Paper
"During this time, a number of life forms emerged and left behind three types of fossils--body, trace and chemical, which can be readily found within rocks formed during the Archaean and Proterozoic Periods. Some of these fossils are actual cellular remains, something which Donovan admits is extremely rare in rocks of this age. The oldest have been dated as about 3.5 billion years and can be found in cherts from the Warrawoona Group near the North Pole, being northwest of Australia, and in the Onverwacht Group in eastern Transvaal (South Africa)."

Tags:Archaean, Proterozoic, paleontology

Abstract
This paper is an examination of life on Earth from its humble beginnings on through the remarkably fecund Cambrian period. Among other things, this paper looks at the Earth's own unlikely beginning, the slow development of life on its surface and the perils it faces. Of special interest, the paper devotes a great deal of time to possible explanations for the recrudescence that took place during the Cambrain period.

From the Paper
"The origins of life on earth have fascinated and engrossed scientists for generations. This fascination, of course, should not be surprising: as human beings, we have an instinctive need to know our past - perhaps because knowing our past gives our lives meaning and context and informs our present and future. Whatever the case may be, the study of life's origins has long been one of the chief pursuits of the scientific community. With this in mind, the following chapter will examine the history of life on planet Earth from the earliest days of our planet, on through the period in which the first simple, multi-cellular organisms emerged, to the "Cambrian Explosion" and the marvelous profusion of life that it created. "

Tags:earth, life, history

Abstract
This paper presents a detailed look at the group of fossils in a certain are of the Grand Canyon in the United States. The paper concentrates on the paleontology of these fossils and their uniqueness.

From the Paper
"The Grand Canyon Supergroup is a thick sequence of Precambrian strata located in-between overlying Paleozoic rocks and underlying crystalline rocks. This Supergroup is comprised mainly by the Nankoweap Formation and the Chuar Group that include three sub-formations and seven members. These formations, groups, and members still puzzle many geologists and paleontologists for their is no conclusive evidence regarding the Supergroup's formation as well as classifying some of the fossils found there. The 2100 meters of the Grand Canyon Supergroup is still undergoing extensive research and will until all the mysteries surrounding it are solved."

Tags:canyon, grand, paleontology, Cambrian, fossils, Arizona, Colorado