University of Arizona

Sense of Place

Geos. 195D

"A" Mt.

A Mt., Tucson
view from A Mt
David Fitzsimmons, AZ Daily Star
"A" Mt., aka Sentinel Peak (elev.: 2,897 ft, 883 m), is right next to downtown Tucson. Is it a volcano (it's shaped like one)? If so, will it erupt again? When? We will speak to these questions and enjoy the nice views from on top. A Mt., Tucson

The UA campus has lots of walls built with rock from A Mt.

The rock was mined from the northeast corner.

Geologic Cross-Sections

Phillips, Mark. 1976. Geology of Tumamoc Hill, Sentinel Peak and Vicinity,
Pima County, Arizona. Master's Thesis, University of Arizona.

McGarvin, T.G. 2001. Field guide to "A" Mountain and description of surrounding region, Pima County, Arizona. Arizona Geological Survey Open File Report, OFR-01-07, 9 p.

From the Top

"A" Mt., the top. Photo—Paul Sheppard, 2020.

Tucson from "A" Mt., 2010.
Photo—Paul Sheppard

Tucson from "A" Mt., 1852.

Snowy Tucson from "A" Mt. Photo—Paul Sheppard, 2010.
A Mt.
Mission Garden from "A" Mt., 2011.
Photo—Gaizka Urreiztieta.

Tumamoc and "A" Mt. from afar.
Photo—Paul Sheppard, 2017.

Mission Garden, 2015. Photo—Paul Sheppard.
Click here to read about the Mission Gardens.

Desert Nightsnake, roadkill, regrettably.
Paul Sheppard, 2017.

Mission Garden, 2017. Paul Sheppard

Red-Tailed Hawk, photo by Wael, 2024


A non-native, introduced grass called buffelgrass (not buffalo grass) is an ecological issue for Tucson specifically and the Sonoran Desert more generally.

Photo—Meghan Marriott, 2014.
pulling grass

pulling grass

pulling grass

On Grass Day 2011, Paul pulled this 10-yard
stretch, in 2 hours. Photos—Paul Sheppard.
pulling grass

pulling grass

pulling grass

On Grass Day 2011, Gary and Julia pulled up on
Skyline Dr. Photos—Gary Huckleberry.

Cruise through the following news articles, op-eds, and letters to the editor.

Buffelgrass on "A" Mt.
Photo—Gary Huckleberry, 2012

Buffelgrass bags on "A" Mt.
Photo—Jim Xerogeanes, 2015

Eagle Scout project: removing buffelgrass

2016 Outlook: Buffelgrass surging ahead this year.

2017 Outlook: Even worse this year.

2018 Outlook: Yet worse this year.

Improve the Sentinel Peak City Park

2017: Sentinel Peak Park to be improved for tourism.

Back to Sense of Place Home Page

Laboratory of Tree-Ring Research, University of Arizona
Tucson, Arizona 85721 USA
Comments to Paul Sheppard: sheppard @