MAPCIS (MASSIVE AUSTRALIAN PRECAMBRIAN/CAMBRIAN IMPACT STRUCTURE) A POSSIBLE MULTIPLE IMPACT EVENT

Background; With the dating, size, angle of impact and trajectory of MAPCIS determined, this question was raised. What other Earth impacts are associated with the accepted date of the Precambrian/Cambrian boundary (~543mya)?

Methods; Searched the most well known Impact databases. The Earth Impact Database by the Planetary and Science Center at the University of New Brunswick lists well studied confirmed impacts. The Suspected Earth Impact Site (SEIS) database by David Rajmon which lists all possible impact sites and grades them from rejected to confirmed. I then reviewed the literature for the individual impact sites.

Results; All the impacts dated closest to the P/C boundary closely followed the previously determined trajectory of MAPCIS and were found nowhere else on the Earth. Camooweal, Gulpuliyul, Foelsche, Calvert Hill, Kelly West, and Amelia Creek form an 1800km long, 23 degree angled wedge that converges at the center of MAPCIS from the North northeast. Amelia Creek at 650km from MAPCIS is also the closest, known impact 545mya or older at the edge of 1.3 million square km Precambrian impact cleared area. The well studied Foelsche impact may contain trapped ejected from MAPCIS as its PDF containing layer blends into the overlying Bukalara Sandstone which completely buried Foelsche.

Conclusions; The dating of older impacts may have been altered by MAPCIS or these impacts were made from pieces of the MAPCIS bolide as it broke apart before final impact. The Foelsche impact site and others like it may contain preserved MAPCIS ejecta with PDFs and warrants further investigation.