Science. 1968 Oct 11;162(3850):261-5. doi: 10.1126/science.162.3850.261.
Shatter cones abound in the central uplift of Sierra Madera and they occur as far as 6.5 kilometers from the center. Apical angles average near 90 degrees. Whole cones and full cones represented by diversely oriented cone segments in any structural block show relatively uniform orientations of axes and a dominant direction of point. The cones predate faulting and folding in the central uplift, and, when beds are restored to horizontal, most cones point inward and upward, a pattern that supports the hypothesis of an impact origin.
碎锥在塞拉马德雷山脉的中心隆起区比比皆是，最远可达中心 6.5 公里。顶角平均接近 90 度。在任何结构块中，由不同方向的锥段代表的完整锥和全锥表现出轴的相对均匀取向和点的主导方向。这些锥发生在中央隆起区的断裂和褶皱之前，当床层恢复水平时，大多数锥指向内部和向上，这种模式支持撞击起源的假设。
