Clues:

1. In 1805, as Lewis and Clark continued their Corps of Discovery expedition across North America, they came upon a hill that their guide Sacagawea identified as a landmark marking the way to her people’s summer retreat — very good news for the travelers, who were anxious to locate it. The hill was named for its resemblance to an animal.

2. The landmark hill, an uplifted block of limestone, was exposed after the sediments around it eroded. It is part of the Mission Canyon Formation and rises above a local river flood plain that bears the same name as the landmark.

3. The limestone formation’s 300-meter-thick base forms the largest artesian aquifer in the United States, and is recharged by precipitation and surface water. The formation also contains many fossils of crinoids and bryozoans, which were abundant when it was deposited.

Name this landmark and its location.

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Clues:

1. This volcano, part of a chain of volcanoes associated with the subduction of a tectonic plate, is a classic stratovolcano that likely formed during the Holocene. Its symmetrical cone is made up of sequential layers of lava flows, ash and mudflows. The volcano towers more than 2,100 meters above a historical city.

2. The volcano has been inactive in historical times, although heavy rains can produce swift debris flows down its steep sides that endanger several cities situated within 10 kilometers of its slopes. Following one such lahar, which destroyed a nearby city in the 16th century, the volcano — once named for the flowers that grew in its rich soil — was given a new name.

3. The volcano’s slopes are currently farmed for a stimulating beverage.

Name this volcano and its location.

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