Did a Huge Impact Lead to the Cambrian Explosion?

Did a Huge Impact Lead to the Cambrian Explosion?

Did a Huge Impact Lead to the Cambrian Explosion?
Astrobiology Magazine, October 14, 2013
http://www.astrobio.net/exclusive/5742/did-a-huge-impact-lead-to-the-cambrian-explosion

Young, G. M, 2013, Evolution of Earth's climatic
system: Evidence from ice ages, isotopes, and impacts
GSA Today. vol. 23, no. 10, pp. 4-10.
http://www.geosociety.org/gsatoday/archive/23/10/abstract/i1052-5173-23-10-4.htm

Text at:
http://www.geosociety.org/gsatoday/archive/23/10/article/i1052-5173-23-10-4.htm
http://www.geosociety.org/gsatoday/archive/23/10/article/i1052-5173-23-10-4.htm#toclink7

PDF file at:
http://www.geosociety.org/gsatoday/archive/23/10/pdf/i1052-5173-23-10-4.pdf

Yours,

Paul H.