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pedum in Namibia, Spain and Newfoundland, and possibly, in the western USA. pedum overlaps the range of the Ediacaran fossils in Namibia, and probably in Spain.The Cambrian Period followed the Ediacaran Period and was followed by the Ordovician Period.Nevertheless, there are arguments that the dated horizon in Oman does not correspond to the Ediacaran-Cambrian boundary, but represents a facies change from marine to evaporite-dominated strata — which would mean that dates from other, more suitable sections, ranging from 544 or 542 Ma, are more suitable.– the sea level was high, which led to large areas of the continents being flooded in warm, shallow seas ideal for sea life.Although there were a variety of macroscopic marine plants but this has proven to be incorrect.Arthropods in general were by far the most dominant animals in the ocean, but trilobites were only a minor part of the total arthropod diversity.What made them so apparently abundant was their heavy armor that was reinforced by calcium carbonate (Ca CO), which fossilized far more easily than the fragile more purely chitin exoskeletons of other arthropods, leaving behind numerous preserved remains which give the false impression that they were the most abundant part of the fauna.The period marked a steep change in the diversity and composition of Earth's biosphere.

Currently only two series and five stages are named and have a GSSP.Although diverse life forms prospered in the oceans, the land is thought to have been comparatively barren—with nothing more complex than a microbial soil crust Most of the continents were probably dry and rocky due to a lack of vegetation.Shallow seas flanked the margins of several continents created during the breakup of the supercontinent Pannotia.The Cambrian marked a profound change in life on Earth; prior to the Cambrian, the majority of living organisms on the whole were small, unicellular and simple; the Precambrian Charnia being exceptional.Complex, multicellular organisms gradually became more common in the millions of years immediately preceding the Cambrian, but it was not until this period that mineralized—hence readily fossilized—organisms became common.

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