This is indirect evidence of photosynthetic organisms." (Armstrong Chapter 2, pp. 6). Thus, photosynthetic organisms have been evidenced to have existed well into the Precambrian. Another source of data concerning life in the Precambrian comes from Continue Reading...
region's geologic formation from the Precambrian Era forward, as well as the glaciation processes that were primarily responsible for carving out and meltwater filling of the Great Lakes. The Great Lakes describes a group of five freshwater lakes l Continue Reading...
Continental tropical (cT) air masses are hot, dry, unstable at low levels and generally stable aloft (upper-level ridge); they originate in northern Mexico. Continental polar (cP) or continental arctic (cA) air masses are cold, dry, and stable origi Continue Reading...
ancient Michigan basin area and discuss a brief geological history of the area and how the mammals that lived during the Ice Age adapted to their environment over the years. Use at least 12 sources of information; use quotes Michigan experienced t Continue Reading...
Since taconite iron ore can be attracted by magnets, it is called a magnetite. Magnetite is abundant in the Minnesota Iron Range as well as the Michigan Iron Range that is located next to Marquette as well as in the Penokee Range in Wisconsin, Minne Continue Reading...
Pan-African Cratonization (about 800 to 680 Ma) Nehlig et al. (2002) conducted a study to review the Pan-African evolution of the Arabian Shield on the premise that new perspectives on the geologic history and structural evolution on the Arabian Shie Continue Reading...
evolution of eukaryotic cells linked to the increase of atmospheric oxygen concentration during the Precambrian? Increase of atmospheric oxygen during the Precambrian period led to creatures which were more dependent on oxygen in the atmosphere. Ox Continue Reading...
Some of the grains weather to a pale green colour. In thin section, quartz is the major grain type (~50%) with some microcline (~5%) and some rock fragments (~1%) all in a fine matrix which consists of quartz and/or feldspar, mica and some calcite c Continue Reading...
