The Geology of Southern New Mexico’s Parks, Monuments, and Public Lands, New Mexico Bureau of Geology and Mineral Resources, 2020 (ISBN no. 978-1-883905-48-4), paperback, 400 pages, $29.95
When travelling around this beautiful state, have you ever wondered how the dramatic landscape came to be? Did you run to pick up a geology textbook to find out? Probably not. But “The Geology of Southern New Mexico’s Parks, Monuments, and Public Lands” will be the a reference you will consult over and over, along with any other local field guides you have on your shelf.
The first thing you notice about this handsome, well-organized book is, of course, the full-color image of the Organ Mountains on the cover. It immediately tempts the reader to delve into the chapter describing their formation. It was a lot more complicated than merely being rift-related. Three super-eruptions 36 million years ago ripped apart a caldera, and subsequent volcanic activity, large-scale faulting and down-dropped basins exposed the 1.4 billion-year-old rocks that are among southern New Mexico’s most popular natural attractions. How odd, then, to learn that an early Spanish name for the Organ Mountains—Sierra de la Solidad—means the “mountain of solitude.”
The second of two books covering New Mexico’s public lands published by New Mexico Bureau of Geology and Mineral Resources—the first volume covers the northern part of the state—this book was written for the general public. A sentence from the preface makes clear the authors’ intention was not to produce “a dry, systematic recitation of geologic studies, but rather. . . a fascinating tale of specifically what created the scenery visible at some of the most beautiful and best-protected places in our state.”
There are many dynamic areas that are not covered, but only because there is no public access to them. Every site with public access in southern New Mexico is discussed. In addition to the text, which is indeed fascinating, the book’s 8 x 10 format and quality paper enhance the presentation of 400 full-color photographs and geologic maps, enticing the reader to learn about the geological history and appreciate the exquisite details of our extraordinary landscape. The images will either introduce new places to explore or trip memories of familiar sites, reminding residents and visitors of the stunning beauty of the area we love.
Each chapter helpfully provides detailed information on how to visit the featured site, including specific directions about how to get there, contact information and website address (if any). The book invites us to get out of our armchairs and personally enjoy the amazing geological features near our communities by hiking the well-described trails of the sites presented.
Six geological provinces are discussed in roughly a counter-clockwise tour of the region. Each province is segmented into more specific areas of interest. For example, the Rio Grande Rift section is divided into 36 chapters, including those devoted to Sierra County sites such as Elephant Butte State Park, Caballo Lake and Percha Dam State Parks, and Lake Valley Back Country Byway.
Each chapter begins with a short overview of the history of the featured site, followed by its geological epoch, rock record and geological history and features. The segmented text allows the reader to easily skip over certain information or delve as deeply as desired. Additional recommended reading is frequently provided.
A color-coded map of all the provinces is located on page 17. The matching color of the clearly presented page numbers at the book’s right margin makes it easy for the reader to find the province of interest. I did notice that there was a mistake in color coding for the two most eastern provinces. The colors for the Southern Great Plains and the Permian Basin are switched on the page numbers, which briefly threw me off, but the name of the province can be found at the top of each even-numbered page, so you always know where you are.
Compared to the better-known but nearly 35-year-old “Roadside Geology of New Mexico,” this reference book is so much more fun, not only because of its attractive photography and maps, but also because of the element of surprise. The reader discovers difficult-to-find places, not just areas that can be seen from major highways.
Altogether, this volume is an exciting piece of research, presented by well-qualified geoscientists who love what they do, and who manage to trigger in even a casual reader an interest in the geology of southern New Mexico.
Happy trails!