![Gaelyn's backpack NR GRCA NP AZ Gaelyn's backpack weighs 23 pounds North Rim Grand Canyon National Park Arizona](https://1.bp.blogspot.com/_55GLukgbBwo/St0iMZKkwFI/AAAAAAAADWg/DGKc_vcngng/s400/01+The+weight+in+-+my+pack+GRCA+AZ+%28768x1024%29.jpg)
Packed the night before our rim to rim Grand Canyon hike and I was sure Amy’s pack weighed much more than Jan or mine’s. But they were 24, 25, and 26 pounds. Not too bad. They did seem to get heavier along the way though.
![Gaelyn, Amy & Jan N Kaibab trail head NR GRCA NP AZ Gaelyn, Amy & Jan North Kaibab trail head North Rim Grand Canyon National Park Arizona](https://2.bp.blogspot.com/_55GLukgbBwo/St0iL-Zvo2I/AAAAAAAADWY/26bNv7ieRAA/s400/02+Gaelyn+Amy+%26+Jan+at+N+Kaibab+trailhead+GRCA+AZ+%281024x768%29.jpg)
Left about 9:30am and mid 40sF. FabGrandma drove us to the trailhead so we wouldn’t have to leave a car or walk an extra two miles. Thanks Karen!
![Fall colors Roaring Springs Canyon GRCA NP AZ Fall colors Roaring Springs Canyon North Kaibab trail Grand Canyon National Park Arizona](https://3.bp.blogspot.com/_55GLukgbBwo/St0iB87AXkI/AAAAAAAADWQ/JrP7KlW9yJ0/s400/03+Fall+colors+looking+into+Roaring+Springs+Canyon+N+Kaibab+trail+GRCA+AZ+%28768x1024%29.jpg)
The fall colors of Quaking Aspen and Rocky Mountain Maple were still brilliant as we quickly dropped in elevation through the Douglas-fir forest. The ladies were already in awe. They had driven in the night before and hadn’t even looked into the canyon.
![View S from N Kaibab trail GRCA NP AZ View south from North Kaibab trail Grand Canyon National Park Arizona](https://4.bp.blogspot.com/_55GLukgbBwo/St0iBZJ3LgI/AAAAAAAADWI/TX-peAuQ60s/s400/04+N+Kaibab+trail+into+Roaring+Springs+Canyon+GRCA+AZ+%281024x768%29.jpg)
Our route began at 8250 feet (2515 meters) and it’s a 3000 foot (930 meters) drop to the intersection of Bright Angel Canyon.
![Mule riders at Coconino overlook N Kaibab trail GRCA NP AZ Mule riders at Coconino overlook North Kaibab trail Grand Canyon National Park Arizona](https://3.bp.blogspot.com/_55GLukgbBwo/St0iA_XM5XI/AAAAAAAADWA/88ukopafk0c/s400/05+Mule+riders+on+Coconino+overlook+N+Kaibab+trail+GRCA+AZ+%281024x768%29.jpg)
It’s .7 miles (1.1 km) to this first great overlook. Many day hikers come this far. The overlook sits at the bottom of the Toroweap limestone deposited some 270 million years ago by an inland sea and on top of the Coconino sandstone formed by dunes some 275 million years ago.
![NR from N Kaibab trail GRCA NP AZ North Rim from North Kaibab trail Grand Canyon National Park Arizona](https://3.bp.blogspot.com/_55GLukgbBwo/St0iAZkyqXI/AAAAAAAADV4/NrSmc0xZgUw/s400/06+Fall+colors+below+the+Coconino+sandstone+N+Kaibab+trail+GRCA+AZ+%28724x1024%29.jpg)
Two miles (3.2 km) down it was almost 60F where we removed layers at the Supai Tunnel, blasted into the rock by the Civilian Conservation Corps (CCC) during the 1930s. Also used the services, compost toilet, and topped off water bottles for the 4 miles (6.4 km) to the Roaring Springs Ranger residence where the next water was available. Unfortunately the water spigot at Roaring Springs only 3 miles (4.8 km) away had been broken most of the summer.
![Redwall bridge below N Kaibab trail GRCA NP AZ Redwall bridge below North Kaibab trail Grand Canyon National Park Arizona](https://1.bp.blogspot.com/_55GLukgbBwo/St0h_2n6-PI/AAAAAAAADVw/7uBVMfyB1qc/s400/07+Looking+down+Roaring+Springs+Canyon+to+Redwall+Bridge+N+Kaibab+trail+GRCA+AZ+%28872x1024%29.jpg)
The habitat below the tunnel changes to a pinyon-juniper woodland with cliff rose, broadleaf yucca, Utah serviceberry and rabbitbrush. The stair-stepped red rock of the Supai Group formed between 315 and 285 million years ago.
![Fossil in Supai group N Kaibab trail GRCA NP AZ Fossil in Supai group North Kaibab trail Grand Canyon National Park Arizona](https://3.bp.blogspot.com/_55GLukgbBwo/St0hbOJjLFI/AAAAAAAADVo/Dou5knX40MA/s400/08+Maybe+conifer+fossil+in+Supai+Group+N+Kaibab+trail+GRCA+AZ+%281024x768%29.jpg)
The Supai reveals a variety of rock reflecting changes in coastal conditions as sea levels fluctuated.
![Calicite crystals N Kaibab trail GRCA NP AZ Calcite crystals North Kaibab trail Grand Canyon National Park Arizona](https://1.bp.blogspot.com/_55GLukgbBwo/St0halFjjLI/AAAAAAAADVg/AYvR74uxE4w/s400/09+Calcite+crystals+on+limerstone+layer+Supai+Group+N+Kaibab+trail+GRCA+AZ+%281024x768%29.jpg)
![Conglomerate N Kaibab trail GRCA NP AZ Conglomerate North Kaibab trail Grand Canyon National Park Arizona](https://3.bp.blogspot.com/_55GLukgbBwo/St0haNRrz-I/AAAAAAAADVY/67HDj1vkqT0/s400/10+Conglomerate+of+pebbles+in+shale+layer+Supai+Group+N+Kaibab+trail+GRCA+AZ+%281024x768%29.jpg)
![Sign N Kaibab trail GRCA NP AZ Geology interpretation sign North Kaibab trail Grand Canyon National Park Arizona](https://1.bp.blogspot.com/_55GLukgbBwo/St0hZkL_eCI/AAAAAAAADVQ/_Tbz7DZQduQ/s400/11+Sign+for+Supai+%26+Redwall+limestone+N+Kaibab+trail+GRCA+AZ+%281024x768%29.jpg)