anybody know about the gould belt? Is that the same as a g cloud?



"Recent astronomical data are employed to make a detailed analysis of periodic terrestrial bombardment by molecular cloud debris during revolution around the Galaxy. Passage through the Gould Belt 3-6 Myr ago would have resulted in glaciation, geomagnetic reversals, and extinction events, all of which have left evidence. The break up of large comets in the solar system after passage through the Belt would produce a large dust and meteor input to the atmosphere, causing a rise of up to 1 percent of C-14 in the atmosphere. The level would be sufficiently high to affect a full climatic cycle. Some glaciation could also occur, and the last Ice Age could have been caused by the progenitor of comet Encke, part of which was the Tunguska meteorite, an interstellar object. It is estimated that further debris from the zodiacal cloud will intersect earth during the period 2000-2400 AD."
Victor Clube, William Napier, The microstructure of terrestrial catastrophism, Journal: Royal Astronomical Society, Monthly Notices (ISSN 0035-8711), vol. 211, Dec. 15, 1984, p. 953-968.