Consideraciones sobre el Cretácico inferior de la zona Jumilla-Yecla.

Abstract

The Lower Cretaceous and its relation with the Upper and the Jurassic are being studied in an elongated zone in a SW-NE direction, called the «Jumilla-Yecla Zone'>, extending approximately from Socovos to Villena and varying in width which is, generally, bordered by fractures. These fractures present two main directions: SW-NE and NW-SE. The first reflect the oíd paleogeographic accidents> while the second divide the zone after sedimentation. The main stratigraphic characteristics of thís area are: the presence of materials from the Portíandian, the marine Neocomian, the Barremian and Albian s.l. in continental terrigenous facies separated by a marine Aptian, and an increase in thickness of the Upper Cretaceous as regards the northern zones. Paleogeographically speaking, this area is situated between the inner Pre-Betie and the Albacete platform. For the Lower Cretaceous no gradual transition is observed with said bordering zones, according to the relative position they now occupy. Finally, the abundance of terrigenous material in the Barremian and Albian is considerable in comparison with the carbonates deposited in the northern as well as in the southern zones. The increase in the marine characters in an eastern direction during the Lower Cretaceous is also noteworthy.