Geographical Society Island (Danish: Geografisk Samfund Ø) is an island in northeastern Greenland

Greenland

Greenland is an autonomous country within the Kingdom of Denmark, located between the Arctic and Atlantic Oceans, east of the Canadian Arctic Archipelago. Though physiographically a part of the continent of North America, Greenland has been politically and culturally associated with Europe for...

 with area 1,717 km². To the north lies Ymer Island

Ymer Island

Ymer Island is an island in northeastern Greenland. Its area is 2,437 km². It is mountainous . The island is a part of Northeast Greenland National Park, the largest national park in the world. It is named for the giant Ymir, the forefather of the Jotuns....

, and to the south lies Traill Ø. In the west, over Kong Oscar Fjord lies Ella Island

Ella Island

Ella Island, or Ella Ø, is an island in eastern Greenland, at the mouth of Kempe Fjord in the northern end of King Oscar Fjord. The island is within Northeast Greenland National Park. It was named by A.G...

.

It is mountainous with Svedenborg Fjeld as the highest point at 1,730 m.

Geology

From west to east, the rocks constituting the island are sandstone of roughly devonian

Devonian

The Devonian is a geologic period and system of the Paleozoic Era spanning from the end of the Silurian Period, about 416.0 ± 2.8 Mya , to the beginning of the Carboniferous Period, about 359.2 ± 2.5 Mya...

, carboniferous

Carboniferous

The Carboniferous is a geologic period and system that extends from the end of the Devonian Period, about 359.2 ± 2.5 Mya , to the beginning of the Permian Period, about 299.0 ± 0.8 Mya . The name is derived from the Latin word for coal, carbo. Carboniferous means "coal-bearing"...

 and cretaceous

Cretaceous

The Cretaceous , derived from the Latin "creta" , usually abbreviated K for its German translation Kreide , is a geologic period and system from circa to million years ago. In the geologic timescale, the Cretaceous follows the Jurassic period and is followed by the Paleogene period of the...

 age, and some smaller areas with triassic

Triassic

The Triassic is a geologic period and system that extends from about 250 to 200 Mya . As the first period of the Mesozoic Era, the Triassic follows the Permian and is followed by the Jurassic. Both the start and end of the Triassic are marked by major extinction events...

 and jurassic

Jurassic

The Jurassic is a geologic period and system that extends from about Mya to  Mya, that is, from the end of the Triassic to the beginning of the Cretaceous. The Jurassic constitutes the middle period of the Mesozoic era, also known as the age of reptiles. The start of the period is marked by...

sandstone.