Extent of Pliocene hyaloclastic deposits and related lava flows in the Columbia Gorge, Oregon and Washington

This dataset contains polygons representing deposits of hyaloclastic debris that were generated between about 3.5 and 3.0 million years ago when a series of basaltic...本数据集包含表征玻屑碎屑（hyaloclastic debris）沉积体的多边形要素，该类沉积体形成于约350万至300万年前，彼时发生了一系列玄武质……