Characteristic of the Carboniferous period (from about 360 million to 300 million years ago) were its dense and swampy forests, which gave rise to large deposits of peat. Over the eons the peat transformed into rich coal stores in Western Europe and North America.

Significance. The bulk of the coal driving the Industrial Revolution and contributing to global warming today has been deposited during the Carboniferous period (359–299 million years ago), resulting in a significant drawdown of atmospheric carbon dioxide at that time.

Dead plants did not completely decay and were turned to peat in these swamp forests. When the sea covered the swamps, marine sediments covered the peat. Eventually, heat and pressure transformed these organic remains into coal.

By the mid-Carboniferous glaciation had spread to Antarctica, Australia, southern Africa, the Indian Subcontinent, Asia and the Arabian Peninsula. During the Late Carboniferous glacial accumulation (c. 300 Ma) a very large area of Gondwana land mass was experiencing glacial conditions.

Answer: South China was warmer in the late Carboniferous than it is today.

358.9 (+/- 0.4) million years ago

The earliest period in which humans could live as a land-based rather than a coastal species would be the Devonian (419-358 MYA) or the Carboniferous (358-298 MYA) eras, during which land-based life spread out and became established.

By the end of the Carboniferous, reptiles had migrated well toward the interior of Pangea. These early pioneers went on to spawn the archosaurs, pelycosaurs, and therapsids of the ensuing Permian period. (It was the archosaurs that went on to spawn the first dinosaurs nearly a hundred million years later.)

Coal forests continued after the Carboniferous rainforest collapse. These plant fossils are from one of those forests from about 5 million years after the CRC. However, the composition of the forests changed from a lepidodendron-dominated forest to one of predominantly tree ferns and seed ferns.

These included the trilobites (which became extinct at the end of the Permian), rugose corals, and sponges. The pelagic, or water column, environment was inhabited by a profusion of cephalopods.

Land animals included primitive amphibians, reptiles (which first appeared in the Upper Carboniferous), spiders, millipedes, land snails, scorpions, enormous dragonflies, and more than 800 kinds of cockroaches.

The Carboniferous Period is formally divided into two major subdivisions—the Mississippian (358.9 to 323.2 million years ago) and the Pennsylvanian (323.2 to 298.9 million years ago) subperiods—their rocks recognized chronostratigraphically as subsystems by international agreement.

Carboniferous amphibians were diverse and common by the middle of the period, more so than they are today; some were as long as 6 meters, and those fully terrestrial as adults had scaly skin.

Cambrian Period, earliest time division of the Paleozoic Era, extending from 541 million to 485.4 million years ago.

541 (+/- 1) million years ago

“Around 499 million years ago, large portions of the ocean were oxygen-deficient and also contained hydrogen sulphide,” says Benjamin Gill of Harvard University. This coincided with a mass extinction among the trilobites, the “giant woodlice” that once dominated the oceans.

1.7 billion years ago the day was 21 hours long and the eukaryotic cells emerged. The multicellular life began when the day lasted 23 hours, 1.2 billion years ago.

They indicate that 620 million years ago the day was 21 hours, says Dr Mardling. Since the dinosaurs lived during the Mesozoic era, from 250 million years ago to 65 million years ago, day length would have been longer than this — probably closer to 23 hours.

4 billion years ago, the moon was a bit closer and Earth’s rotation was faster — a day on Earth was just over 18 hours. On average, we gain 0.00001542857 seconds a year.

Thanks to the ancient civilizations that defined and preserved the divisions of time, modern society still conceives of a day of 24 hours, an hour of 60 minutes and a minute of 60 seconds. Advances in the science of timekeeping, however, have changed how these units are defined.

Answer. Answer: A day has 24 hours. Therefore 4 hrs is one-sixth of a day.

The answer is 16 hours.

In 8 d there are 192 h . Which is the same to say that 8 days is 192 hours.

19 hours is equal to 0.79 days.