Cambrian Ocean World: Ancient Sea Life of North America by John Foster
By John Foster
This quantity, geared toward the final reader, offers existence and instances of the fantastic animals that inhabited Earth greater than 500 million years in the past. The Cambrian interval was once a severe time in Earth’s historical past. in this colossal span of time approximately each sleek workforce of animals seemed. even though lifestyles have been round for greater than 2 million millennia, Cambrian rocks guard the checklist of the 1st visual appeal of complicated animals with eyes, protecting skeletons, antennae, and complicated ecologies. Grazing, predation, and multi-tiered ecosystems with animals residing in, on, or above the ocean ground turned universal. The cascade of interplay ended in an ever-increasing diversification of animal physique kinds. via the top of the interval, the ancestors of sponges, corals, jellyfish, worms, mollusks, brachiopods, arthropods, echinoderms, and vertebrates have been all in position. The facts of this Cambrian “explosion” is preserved in rocks around the globe, together with North the US, the place the likely unusual animals of the interval are preserved in beautiful aspect in deposits reminiscent of the Burgess Shale in British Columbia. Cambrian Ocean World tells the tale of what's, for us, an important interval in our planet’s lengthy background.
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Extra resources for Cambrian Ocean World: Ancient Sea Life of North America (Life of the Past)
Ocean Levels and Tides During the Cambrian, sea levels were generally quite a bit higher than they are today. Cambrian rocks record a general rise in sea level throughout the 54 million years of the period, but within that overall rise there appear to be approximately 28 minor rises and falls of sea level. The important part is that only a handful of times did the sea level fall to or below the present day level, but during nearly every rise it came up higher than it had last time (thus the overall increase throughout the Cambrian).
Parker Slate miles to the south before coming to the shores of the polar supercontinent of Gondwana. Gondwana contained four of the seven modern continents (Africa, South America, Australia, and Antarctica) plus smaller elements of other continents. Florida, parts of New England, and Nova Scotia, for example, were part of Gondwana. 12 Laurentian fossil sites found in North America today were scattered mostly on the continental shelves in shallow-marine water around the ancient continent during the Cambrian (fig.
A) Hemisphere with Laurentia. (B) Opposite hemisphere. A Panthalassic Ocean Laurentia Siberia Equator Iapetus Ocean Baltica Gondwana = Land Areas = Shallow Marine Shelves B Panthalassic Ocean Equator Gondwana 18 Cambrian Ocean World Sirius Passet A Burgess Shale Sites Black Hills Spence Gulch House Range Highland Range Montezuma Range Emigrant Pass Frenchman Mountain St. Croix Valley Parker Slate Kinzers Fm. Dotsero Fm. 4. Geography of the Cambrian in North America. (A) Locations of some of the sites visited in this book.