* 1870 – Old Faithful Geyser is observed and named by Henry D. Washburn during the Washburn-Langford-Doane Expedition to Yellowstone.

In 1870, Henry D. Washburn, having been appointed Surveyor General of Montana in 1869, organized the Washburn-Langford-Doane Expedition in Helena to explore the regions that would become Yellowstone National Park.

* Henry D. Washburn, Surveyor General, Montana Territory and commander of the Washburn-Langford-Doane Expedition to Yellowstone in 1870

In 1870, when the Washburn-Langford-Doane Expedition passed through the area they began calling the river Gardiner -- a phonetic error.

Old Faithful was named in 1870 during the Washburn-Langford-Doane Expedition and was the first geyser in the park to receive a name.

On the afternoon of September 18, 1870, the members of the Washburn-Langford-Doane Expedition traveled down the Firehole River from the Kepler Cascades and entered the Upper Geyser Basin.

Walter Trumbull of the 1870 Washburn-Langford-Doane Expedition described a unique event while a man was fishing adjacent to the cone: "... in swinging a trout ashore, it accidentally got off the hook and fell into the spring.

Although many prospecting parties traversed the Yellowstone region throughout the 1850-60s, the first detailed descriptions of the lake came in 1869, 1870 and 1871 as a result of the Cook – Folsom – Peterson Expedition, the Washburn-Langford-Doane Expedition and the Hayden Geological Survey of 1871.

Although trappers and prospectors who visited the Yellowstone region had knowledge of the canyon, the first significant descriptions were publicized after the Cook – Folsom – Peterson Expedition of 1869 and the Washburn-Langford-Doane Expedition of 1870.

Leading the expedition was Lt. Gustavus C. Doane, who had led the Washburn-Langford-Doane Expedition in 1870, the first extensive federal survey of the Yellowstone territory, that was responsible in part for the formation of Yosemite National Park.

On September 18, 1870, the Washburn-Langford-Doane Expedition entered the Upper Geyser Basin.

Grand Teton's name was first recorded as Mount Hayden by the Washburn-Langford-Doane Expedition of 1870.

In 1870 the Washburn-Langford-Doane Expedition visited the spring, noting a geyser nearby ( later named Excelsior ).

During the December 1871 congressional debate on the creation of Yellowstone National Park, Senator Trumbull, whose son Walter Trumbull was a member of the Washburn-Langford-Doane Expedition to Yellowstone in 1870, made this impassioned statement in support of the park idea:

The earliest images of the falls were drawn by Private Charles Moore, a member of the U. S. Army escort of the Washburn-Langford-Doane Expedition which explored the Yellowstone River in August – September 1870.

On September 18, 1870 the Washburn-Langford-Doane Expedition entered the Upper Geyser Basin along the Firehole River.

* September 18 – Old Faithful Geyser is observed and named by Henry D. Washburn during the Washburn-Langford-Doane Expedition to Yellowstone.

Many of the early expeditions to the area that would later become Yellowstone National Park traveled along the Yellowstone River, including the Cook – Folsom – Peterson Expedition and the Washburn-Langford-Doane Expedition.

* Henry D. Washburn, American congressman and explorer who headed the Washburn-Langford-Doane Expedition to survey Yellowstone National Park

From 1870 through 1925, the company was inwardly focused on fully exploiting the Rio Tinto Mine, with little attention paid to expansion or exploration activities outside of Spain.

In 1870, the government abolished the HBC monopoly and opened trade in the region to any entrepreneur.

To enforce that model, both sides have divergent language policy and educational systems, although the linguistic boundary is in fact well inside France, and the Alsace region changed hands four times between 1870 and 1945.

In 1870 diamonds were discovered in Kimberley, while in 1886 some of the world's largest gold deposits were discovered in the Witwatersrand region of Transvaal, quickly transforming the economy into a resource-dominated one.

Following 1870 however they began a campaign for better education facilities in the region.

In 1870, they came to an agreement to define spheres of influence: the Colorados would control Montevideo and the coastal region, the Blancos would rule the hinterland with its agricultural estates.

Born in 1870 in Brünn ( Brno ) in the Moravia region of the Austro-Hungarian Empire to an ethnically German family, Loos was nine when his father, a stonemason, died.

After the Red River Rebellion of 1869 – 1870, many of the Métis moved from Manitoba to the Fort Carlton region of the North-West Territories, where they founded a settlement at Batoche on the South Saskatchewan River.

Subsequently they moved to Bar-le-Duc ( 1870 ), Nogent-sur-Seine ( 1876 ), and Wassy-sur-Blaise ( 1879 ), although they continued to spend summers in Villeneuve-sur-Fère, and the stark landscape of that region made a deep impression on the children.

By the end of the Prussian Kingdom in 1870, over 3 million people lived in the Ruhrgebiet and the new coal-mining district had become the largest industrial region of Europe.

By 1870, however, much of the excess population of the region had been drained off to other mining rushes and returns on claims had fallen somewhat.

It was founded by European Americans in 1870 around the area coal fields, and was named for John Baylis Earl, a lawyer who was central in developing the coal industry in the region.

In 1870, the Lake Superior and Mississippi Railroad was completed in this region.

Because of Murray's central location and access to the railroad, the first smelter was built there in 1870 and Murray became home to some of the largest smelters in the region over the next 30 years.

Langford was a member of the 1870 Washburn – Langford – Doane Expedition which explored portions of the region that soon would become the Yellowstone National Park.

By Act of June 4, 1870 of Colombia was created Shire Tulenega, which also included the present territory of the District Guna Yala, the various communities of the District of Wargandí as Mordi, and Sogubdi Asnadi, as well as the communities of the region of Madungandi as Tiuarsicuá, and communities Guna of Colombia, as Tanela and architecture.

After separation of Panama in 1903, was completely unknown the Act of 1870, and also the territory of the former region, was divided de facto into two parts: the majority remained in the new Republic of Panama, while a small portion remained in Colombia.

France annexed Alsace-Lorraine, the region which had been ceded to the German Empire after the 1870 Franco-Prussian War.

The North-Western Territory was a region of British North America until 1870.

From 1870 to 1905, the region which is now Saskatchewan was part of the North-West Territories, established by the Parliament of Canada.

In 1870, he returned to St. Petersburg and travelled to Dagestan, in the northern Caucasus region, which had been annexed by the Russian Empire only ten years previously.

The region was named after John Wodehouse, 1st Earl of Kimberley who served as Secretary of State for the Colonies from 1870 to 1874 and 1880 to 1882.

The placer gold in the streams was exhausted quickly, however, and by 1870 the miners began leaving the region.

After 1786, their territory was officially called Don Voisko Lands, and was renamed Don Voisko Province () in 1870 ( presently part of the Rostov, Volgograd, and Voronezh regions of the Russian Federation as well as part of the Luhansk region of Ukraine ).