Admiral Sulivan had previously discovered an astonishingly rich accumulation of fossil bones not far from the strait. These remains apparently belonged to a more ancient period than collections made by Darwin on HMS Beagle and other naturalists, and therefore were of great scientific interest. Many of these fossils were collected with the aid of hydrographer Richards R. N. and deposited in the British Museum.[46] The Admiralty compiled advice to mariners of the strait in 1871.[47]