Description and significance. Anaplasma marginale is the most prevalent tick-borne, livestock pathogen worldwide and poses a considerable constraint to animal health. The disease results in significant morbidity and mortality of United State's (US) cattle population, which affects the exportation of beef.
The Geological period consists of time periods in the origin and evolution of earth. The earth is about 4.5 billion years old. The time from the origin of the earth to the present is divided into super eons, eons, eras and periods. The Precambrian period is a super eon that is sub-divided into three eons: â¢ the Hadean Eon (4.5 to 3.8 billion years before present), â¢ the Archean Eon (3.8 to 2.5 billion years before present),, and.
This period lasted from about 653 million years ago until 542 million years ago. Geology: during this time period the earth was a supercontinent called Rodinia. The earlier period of the Ediacaran consisted of a number of glaciations, commonly called. The varanger- marinoan ice ages.