page_title: Herald Island (Arctic)
section_title: Geology
hierarchical_section_title: Herald Island (Arctic) / Geology
caption_attribution_description: English: HERALD ISLAND
context_page_description: Herald Island is a small, isolated Russian island in the Chukchi Sea, 70 km to the east of Waring Point, Wrangel Island. It rises in sheer cliffs, making it quite inaccessible, either by ship or by plane. The only bit of accessible shoreline is at its northwestern point, where the cliffs have crumbled into piles of loose rocks and gravel. Its area is 11.3 km² and the maximum height above sea level is 364 m. The island is unglaciated and uninhabited.
  Herald Island belongs administratively to the Chukotka Autonomous Okrug of the Russian Federation. Along with Wrangel Island, Herald Island is part of the Wrangel Island Wildlife Preserve, a Russian National Park, since 1976. Cape Dmitrieva on Herald Island, marks the easternmost limits of the nature reserve.
  Herald Island is named after survey vessel HMS Herald, from which the island was discovered in 1849.
context_section_description: Herald Island is composed of sedimentary, metamorphic, and igneous rocks. The northeastern tip of this island consists of a 600 m (1,969 ft)-thick sequence of sandstone, phyllite, quartzose sandstone, quartz-chlorite-sericite schist mylonite, and cataclastic quartz syenite. These rocks are of either Proterozoic or Late Paleozoic age. The bulk of this island consists of a Jurassic granite pluton.
caption: Herald Island; 1881 sketch by John Muir, who attributed the island's form to glacial action
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