As regards life-zones, the occurrence of Dipodomys ordii in the lower part of the Lower Sonoran Life-zone on the off-shore beach 88 and 90 miles south of Matamoros is low zonally and perhaps is at or near the zonal margin of the range of the species.
"Mammals Obtained by Dr. Curt von Wedel from the Barrier Beach of Tamaulipas, Mexico"
E. Raymond Hall
A zonal arrangement of minerals about intrusives is often noted.
"The Economic Aspect of Geology"
C. K. Leith
It has come to be recognized that the zonal arrangement caused by enrichment from the surface has been imposed usually on a zonal arrangement caused by the primary hot solutions and not related to the surface but to the source of the solutions.
"The Economic Aspect of Geology"
C. K. Leith