Fig. 6: The sand spike occurrence near Mount Signal in southern California, USA. | Nature Communications

Fig. 6: The sand spike occurrence near Mount Signal in southern California, USA.

From: Sand spikes pinpoint powerful palaeoseismicity

Fig. 6

a Typical sand spike from Mount Signal, California. The sand spikes occurs within a horizon with convolute bedding, dikes, and sills (image: Mila Zinkova, USRA Earth Science Picture of the Day, 24 November 2013; https://epod.usra.edu/blog/2013/11/sand-spike-concretions.html). b Sand spike from Mount Signal described by Garner (1936; redrawn after his Fig. 4). c Simplified geological situation in the Imperial Valley, California, with the sand spike occurrence at Mount Signal and the most prominent faults of the San Andreas transform fault system indicated. Apices of the sand spikes are orientated away from the San Andreas fault system and perpendicular (or even opposite) to the general drainage system in the Imperial Valley.

Back to article page