Siljan Ring Siljan Ring The Siljan Ring () is a prehistoric impact crater in Dalarna, central Sweden. It is one of the 15 largest known impact craters on Earth and the largest in Europe, with a diameter of about . The impact that created the Siljan Ring occurred when a meteorite collided with the Earth's surface during the Devonian period, about 376.8 ± 1.7 Ma. This coincides around the first Devonian extinction, the Kellwasser Event or Late Frasnian extinction at 376.1 Ma ± 1.6 Ma. The effects of the impact can clearly be seen in the bedrock in the area. The Cambrian,
Mora River Mora River Mora River, also known as Rio Mora, is a stream in Mora and San Miguel County, New Mexico. Its headwaters are on Osha Mountain of the Sangre de Cristo Mountains. The river flows downstream primarily through private land, but there are areas for fishing brown and rainbow trout below on public land in the town of Mora. It is a tributary of Canadian River. It was called "Rio Mora" or "Rio de lo de Mora" on early maps. There is a separate stream "Rio Mora" that is a tributary of Pecos River. The headwaters are located in the