The Colorado Archaeological Society

Programs and Field Trips

Next Meeting

Tuesday, May 21, 2014, 7:00 PM

Lamb Spring Archaeological Preserve: A Place Where People and Now-Extinct Animals Lived 10,000–15,000 Years Ago

Presenter:  Jack C. Warner, Long-Time Volunteer at Lamb Spring

Located in ranch country southwest of Littleton, Lamb Spring Archaeological Preserve is one of Colorado’s most important Paleo-Indian archaeological sites. Excavated several times between 1960 and 1997, it contained artifacts from repeated human use from the Cody complex, a Paleo-Indian culture group, through modern times. Artifacts indicate people hunted and camped around the spring for the past 9,000 years and possibly much longer. The site contains spear points and bison bones that are the remains of a hunt that took place at the spring sometime between 9,000 and 8,400 years ago. In addition, this site contains one of the largest concentrations of Columbian mammoth bones ever found over 30 individuals in a relatively small area near the ancient spring. Some of the mammoth bones show signs of human butchering. One bone has been dated at 15,693 years ago, making this one of the oldest Paleo-Indian sites ever documented in Colorado. Bones of other extinct species found here include Ice Age camels, horses, sloths, llamas, and wolves. Join us to learn why Lamb Spring is an important contribution to the archaeological record.

About Jack C. Warner:

A lifelong student of the archaeology and anthropology of early humans. Warner is experienced in archaeological fieldwork and regularly gives talks and tours relating to Colorado prehistoric archaeology, including Lamb Spring Archaeological Preserve. He is a past president of the Colorado Archaeological Society and is the archaeology lead for the Ken-Caryl Ranch Historical Society. Warner is author of the book Eagles and Lions of Land and Sea, which documents the places in the world he has found the most interesting. He received his MS from Cornell University and MBA from the University of Michigan

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Meeting ID: 704800334#

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Fire Station 19
2490 Research Parkway
Colorado Springs, Colorado, 80920

Future Field Trips

May 25, 2024

Lamb Spring Archaeological Preserve

Visit the only paleolithic archaeological site open to the public in the entire state of Colorado! This important archaeological site dates back at least 15,500 years. Located on open ranch land, our guide will paint a picture of life at this spring over the course of thousands of years.


  • Free – no entrance fee! 
  • Tour is 1½ hours long. This is a private tour led by Jack Warner, previous CAS President, and longtime Lamb Spring volunteer. (No pets allowed.) 
  • Expect about ½ mile of walking on an unpaved road with a mild slope. 
  • We will be outdoors the entire time, in open ranch country, so plan to dress for the weather. (Bring hat, sunscreen, layers, water, optional folding chair.) Be aware that there is NO indoor facility with lots of pretty displays. Jack will describe life at this spring for early humans who hunted and camped here as well as some of the Ice Age mammals that gathered at the spring: camels, horses, sloths, llamas, wolves, and mammoths. He will pass around a small artifact display case, and we will see an impressive mammoth skull, found at this site. 
  • Lamb Spring is located near Littleton, Colorado. (The general location is between Chatfield State Park and Roxborough State Park.) 
  • Please note: You are responsible for your own carpooling arrangements. 
  • There is NO water and NO bathroom on site. You may want to allow time for a quick rest stop on the way. (Jack recommends the Safeway at the Roxborough Marketplace shopping center, 8355 North Rampart Range Road, Littleton.) 
  • CHAPTER POLICY: You must be a member to participate in field trips. 
  • When you sign up, you will receive an email containing (a) a Lamb Spring tour packet with directions, map, and waiver of liability form, (b) the PPC/CAS waiver form. You must bring both forms – signed – to the field trip.


  • Waterton Tavern (in the Roxborough Marketplace shopping center), 8361 North Rampart Range Road, Littleton, CO 80125, (720) 362-2337 
  • Check out the menu at

Future Programs

June 18, 2024

The Prehistory & History of the Baca National Wildlife Refuge

Photo – Baca National Wildlife Refuge

Visit the only paleolithic archaeological site open to the public in the entire state of Colorado! This important archaeological site dates back at least 15,500 years. Located on open ranch land, our guide will paint a picture of life at this spring over the course of thousands of years.

Jen Kolise, Regional Historic Preservation Officer, US Fish and Wildlife Service Region 6

Nestled against the Sangre de Cristo Mountains in the northeastern portion of San Luis Valley, the Baca National Wildlife Refuge is a haven for migratory birds and resident wildlife. Established in the early 2000s, the Refuge protects important cultural, ecological, and natural resources in the valley. Due to its rich and diverse natural resources—including grasslands, wet meadows, and riparian corridors—this area has been home to human populations for over 12,000 years. Of more recent note, the Refuge includes 44,500 acres of the original 100,000-acre Baca Land Grant No. 4 that was granted to Luis Maria Baca in 1862. In 2023, the Baca Ranch Rural Historic Landscape was listed in the National Register of Historic Places. This rural historic landscape includes multiple historic buildings, along with historic agricultural lands.

About Jen Kolise

Jen Kolise is the Regional Historic Preservation Officer for the Mountain-Prairie Region of the US Fish and Wildlife Service (USFWS). This region covers eight states: Colorado, Kansas, Montana, Nebraska, North Dakota, South Dakota, Utah, and Wyoming. During her teenage years, she found her passion for archaeology and participated in her first excavation at the age of 15. As a professional archaeologist, she has mainly focused on cultural resources management. Prior to transferring to the USFWS, she was the Cultural Resources Manager & Tribal Liaison at US Army Garrison Fort Carson, Colorado. She earned her BS in anthropology from the University of New Mexico and MA in anthropology from the University of Arkansas.

Field Trip, June 22nd – There will a field trip to Baca National Wildlife Refuge in San Luis Valley for Chapter members only.


August 20, 2024

Excavating the “Swift Water Place” Site in Alaska

Presenter:  Dr. Bruce Lutze, Archaeologist