http://reply.papertrans.cn/1/40/3992/3992-31.png
http://reply.papertrans.cn/1/40/3992/3992-32.png
http://reply.papertrans.cn/1/40/3992/3992-33.png
http://reply.papertrans.cn/1/40/3992/3992-34.png
Submitted on: 14 January 2015.
Revised on: 25 February 2015.
Accepted on: 12 March 2015.
___________________Boletin de Geologia---UNIV INDUSTRIAL SANTANDER
Submitted on: 03 October 2006.
Revised on: 22 November 2006.
Accepted on: 10 December 2006.
___________________Boletin de Geologia---UNIV INDUSTRIAL SANTANDER