A man was found dead on a trail in Texas' Big Bend National Park. 

According to the National Park Service, the park's communications center received notice of the fatality along the Chimneys Trail on Thursday at 7:45 p.m. local time.

Rangers responded and a 75-year-old Houston man was located approximately half a mile from the trailhead. 

The park service said there was no obvious cause of death.

MISSING HIKER FOUND DEAD AT UTAH'S CANYONLANDS NATIONAL PARK

Big Bend National Park flowers

FILE - Flowers grow overlooking the Chisos Basin on Oct. 16, 2016, in the Big Bend National Park in West Texas. Big Bend is a rugged, vast and remote region along the U.S.-Mexico border and includes the Big Bend National Park.  (John Moore/Getty Images)

"Big Bend National Park staff and partners are saddened by this loss," Deputy Superintendent David Elkowitz said in a statement, "and our entire park family extends sincere condolences to the hiker's family and friends."

The Chimneys Trail is a moderate difficulty 5-mile round trip hike to prominent volcanic formations in the western desert of the park.

The Rio Grande River at Big Bend National Park

The Rio Grande running through Big Bend National Park (Education Images/Universal Images Group via Getty Images)

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The agency noted that summer weather in Big Bend is extremely hot, with temperatures over most of the park reaching more than 100 degrees Fahrenheit by late morning and increasing to "exceedingly dangerous levels" until long after sunset.

Big Bend National Park

An RV camp sits within the Chisos Basin of the Big Bend National Park on Oct. 16, 2016, in West Texas.  (John Moore/Getty Images)

On Thursday afternoon, the temperatures along the trail exceeded 104 degrees Fahrenheit. 

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"Park Rangers wish to remind all visitors to be aware of the dangers of extreme heat. Hikers should be prepared to carry and drink one gallon of water per day and to plan on being off desert trails by noon," the park service concluded.