2010-D 25C Grand Canyon NP (Regular Strike)

2010 Grand Canyon National Park Quarter

The selection of Grand Canyon National Park for the America the Beautiful Quarters series was an inevitability. More than a mere landmark, the canyon is a global icon of natural grandeur and a cornerstone of the American conservation movement. The artistic challenge lay not in the subject itself, but in translating its immense scale onto the 24.3-millimeter canvas of a circulating quarter.

To achieve this, U.S. Mint Medallic Artist Phebe Hemphill focused on a specific archaeological treasure: the Nankoweap Granaries. Located within Marble Canyon in the park’s northern reaches, these ancient structures overlook the Colorado River. By centering the cliff face, Hemphill provided a sense of movement and scale that honors both the geological and human history of the site.

Carving a Wonder: The Geological Saga

The Grand Canyon is the result of two distinct narratives operating on vastly different timescales: the ancient formation of the rock layers and the relatively recent carving of the canyon by the Colorado River.

The Rock Record

The canyon walls offer one of the most complete geological cross-sections on Earth. At the base of the Inner Gorge lies the Vishnu Schist, formed nearly two billion years ago. Above this lies the Great Unconformity, a gap in the geological record representing hundreds of millions of years of missing history. The story resumes with Paleozoic sedimentary layers—sandstones, shales, and limestones—deposited by ancient seas. The sequence concludes at the rim with the Kaibab Limestone, which is approximately 270 million years old.

The River’s Path

While the rocks are ancient, the canyon itself is a geological "newcomer.

• "The "Young River" Theory: Traditionally, scientists believed the Colorado River began its work 5 to 6 million years ago. This process was accelerated by the Laramide orogeny, which uplifted the Colorado Plateau and increased the river's erosional velocity.
• The "Composite Canyon" Theory: Recent research, including uranium-lead dating, suggests a more complex "composite" origin. This theory proposes that the modern canyon is an amalgamation of several older segments—some perhaps 70 million years old—that were eventually linked by the Colorado River within the last 6 million years.

From Sacred Space to National Park

For millennia before European contact, the Grand Canyon was the ancestral home of numerous Native American peoples. While Spanish explorers first sighted the canyon in 1540, it remained largely unmapped by the West until John Wesley Powell’s daring 1869 expedition.

The Legislative Struggle

The path to preservation was an arduous 37-year struggle:

• 1882–1886: Senator Benjamin Harrison introduced the first park bills, which failed repeatedly in a resource-extraction-focused era.
• 1893–1908: Now President, Harrison established the Forest Reserve. Later, Theodore Roosevelt used the Antiquities Act to designate the Grand Canyon National Monument in 1908, famously stating, "You cannot improve on it. The ages have been at work on it, and man can only mar it."
• 1919: After decades of opposition, President Woodrow Wilson finally signed the act establishing Grand Canyon National Park on February 26.

Quarter Release

The Grand Canyon Quarter was the fourth issue of the inaugural 2010 America the Beautiful sequence.

2010 Emission Sequence

• Hot Springs (Arkansas) – April 19
• Yellowstone (Wyoming) – June 1
• Yosemite (California) – July 26
• Grand Canyon (Arizona) – September 20
• Mount Hood (Oregon) – November 15

The Launch Ceremony

The official launch took place on September 21, 2010, at the South Rim. Co-hosted by Mint Director Ed Moy and Superintendent Steve Martin, the event featured a performance by the Pollen Trail Dancers. Children in attendance received a free quarter to commemorate the debut.

Circulation Strike vs. Mint Set Coins

Coins struck for circulation possess a different surface texture than those produced for the Mint's annual Uncirculated Coin Set. On Mint Set coins, the surfaces exhibit a uniform, satin appearance. These specimens were handled with greater care, and it is not unusual for coins extracted from these sets to grade in the Superb Gem range. Business strikes, however, were produced on high-speed presses and often possess a booming, "cartwheel" luster. Unlike the protected Mint Set coins, business strikes are only found mark-free by chance, as they typically sustain contact marks during the automated binning and bagging process.

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