Four Corners Research-Archaeology in the Mesa Verde Region

Four Corners Research ® 7823 Road 25, Cortez, CO 81321    970-565-8758   ​
West end of Mitchell Springs Sector 11 great kiva. Note western floor vault and double bench. Arrow scale just outside the center of vault is 25 cm long. Roofing a structure of this size is no small engineering feat. The floor and roof were rebuilt and replaced at least twice.
Mitchell Springs Pit Structure 6 is approximately 8 meters across. It was set ablaze without salvaging useable roof beams. The Sector 11 great kiva was built over the top of it.
Approximately 80 Tree-Ring were collected from the burned roof of Structure 46 at Champagne. .
The MS great kiva was built over the top of a burned over-size pit structure that was built in A.D. 787.using many beams from an earlier structure that was built in A.D. 757  Note adobe column-like veneer at the bottom of NW main roof support post..
One of several quartz crystals from the west end of the MS great kiva. Hundreds of shell and turquoise beads were found in the upper and mid fill.
Shell and turquoise was quite abundant in the Mitchell Springs Sector 11 great kiva fill.
Knife blade from floor of MS Sector 11 great kiva, from beneath floor ramp feature near the western floor vault.
Portion of the south end of Mitchell Springs Sector 11 great kiva tested in 2002.
Turquoise bead from the floor fill below the roof of the MS great kiva.
Kiva 3 circa A.D. 950.  This structure incorporated an unusual SW ventilator. Note the masonry style of this early kiva. The wall niche at center-right in photo measures almost 25 cm across.
Small MS great house (Pueblo B) showing areas tested. This structure contains a 10+ meter diameter court kiva and multi-story construction.  Thick dashed line delineates the exterior of the building. A second kiva is located in the center-left of structure and was rebuilt in the 13th century.
Glendale College Field School working in the western end of Sector 11.  Excavations tested 8 surface rooms and 3 pit structures or early kivas. This area of the site was occupied during the A.D. 850-950 period.
Excavators working on Seg 9 of Room 1 on the east end of the North Hill at Champagne Spring. This and other structures in the immediate area were abandoned around A.D. 950-1000.
Randi taking a short break from her work in Champagne Spring Structure 37. In an unusual kiva closing ritual, numerous animals were simultaneously buried inside and around a stone cairn feature which stood more than a meter tall.
Below the Champagne Spring site in Squaw Canyon, this interesting petroglyph panel contains several mountain lion figures.
Sketching the floor plan and floor features of Structure 46 at Champagne Spring. The floor had unusual floor grooves and 5 sets of paired post holes. Some of these may have been used to anchor altars that could be moved during ceremonies. Note burned roof in strata,
Structure 37 during excavations in the south end of this kiva. Over 40 animals were sacrificed and then buried. The work is very slow due to the heavy amount of documentation and cramped working conditions.
T.Mitchell Pruden making notes  by "Unit 1" at Mitchell Springs circa 1914
Click on an image above to enlarge
This web site was created to function as a repository for information and photographs generated during research and survey projects performed by Glendale Community College, Scottsdale Community College and Paradise Valley Community College from 1988-2004.  Subsequent research conducted by members of various Chapters of the Colorado Archaeological Society will also be posted here.  Many of these members have decades of experience in the field and laboratory.  Over the last 23 years, we have conducted private property survey's of the Mitchell Springs and Champagne Spring community's.  As time permits, earlier publications and reports will be linked for easy access.  Current research involves test excavations at the Mitchell Springs  Ruin Group and Champagne Spring Ruins.  We are also working on a project that explores the chemical composition and trade patterns of San Juan redware in the Mesa Verde region and SE Utah. 

More information can be accessed by navigating to the links to the upper left of this page.   

Many thanks to the Verde Valley Archaeological Center and the Arizona Archaeological Society for all of the help.

From Pueblo A at the Mitchell Springs Ruin Group looking east toward Point Lookout, Mesa Verde National Park, Camp is under the big tree in meadow
Looking east from the Mitchell Springs Community toward Mesa Verde National Park visible in the distance
Some items above are from the Mitchell Springs - Sector 11 Great Kiva floor. Shown here are non-local spondylus beads and a jet ring.  This and three partial jets rings were found on one of the many floor surfaces. Approx 50 turquoise beads measuring 3.5 mm with 2 mm inlaid jet rings were also on the floor along with a broken Chaco Black-on-white cylinder mug.  Folks either lost some of their adornments in the dimly lit chamber or they were deliberately placed there.

     Wrapping up for the winter has taken us into the new year.  Winter preparations of the exposed  portions of the tri Wall and Pueblo A has led to some new and interesting discoveries over the last few months.  In 1988 and 1989, tests of the tri Wall revealed an unusual architectural configuration that is somewhat different than what can be gleaned form the dozen or so tri walls known to exist.  Vivian's (1959) seminal work on these enigmatic buildings is the only published work that I know of on tri walls that also involved excavation.  He and his associates used relatively modern excavation and recording techniques that have allowed later researchers to utilize his data.  No others have been tested or excavated since then. Vivian tried to rebuild the record from earlier excavations that had been performed on the Pueblo del Arroyo great house tri wall in Chaco and the Hubbard Mound tri wall at Aztec with limited success. Most known tri walls consist of three concentric walls; the innermost being the smallest circumference and the outer, the greatest.  The chambers created by the concentric walls were usually further divided by cross-walls creating many different compartments that are generally featureless.  It is likely that these chambers held perishable products however, those excavations were performed before pollen and flotation techniques were developed so at this point, no proof has been detected to confirm this.  It is known however that whatever may have been stored in these chambers was gone by the time excavators had an opportunity to examine the deposits within the chambers. 
    Vivian concluded that the innermost concentric walls of the Hubbard Mound at Aztec probably contained a building  similar to the kiva.  Our 1988-89 studies at Mitchell Springs revealed a structure that is somewhat different than these in that the inner chamber appeared to have performed as a platform used for burning large fires. Last month, during tests inside this portion of the structure, evidence to suggest the existence of an inner tower was found. 
    We are taking a closer look at the Mitchell Springs tri wall in an effort to add modern data to what is currently known about these buildings. To my knowledge, all known tri walls except the one at Mud Springs are on publicly managed lands and it is unlikely that any excavation or productive analysis will ever take place on these until at least A.D. 2275 or beyond.  Over the last 3 months, many new discoveries have been made during the process of exposing the tops of the walls of the Tri Wall and the west end of Pueblo A.  We'll prepare a manuscript on this work that will be submitted for publication later this year.    
    We'd like to know more about the Basketmaker III presence in the Mitchell Springs Community.  Unfortunately. the density of later occupations appears to have obscured much or the architectural evidence.  Surveys and excavations indicate that a substantial population lived in and nearby the central community during this period.  Joel Brisbin reported (1971) that a large Basketmaker III structure existed on the north side of the main village inside the City of Cortez.  Another large circular structure which probably dales to this period or Pueblo I is located nearby.
     In the ninth century the population of the community exploded, growing to many hundreds of rooms and setting the stage for the entry of the Chaco System and the construction of  new public architecture.  Four great houses and two 10+ meter kivas were constructed at the village center.  Within the course of less than 100 years the Chacoan System had collapsed leaving diminished population levels in the Mitchell Springs community.  By 1230 or 1240 A.D. the community and large portions of the Montezuma Valley became depopulated.  People consolidated into fewer and generally larger villages and defensible locations with a source of fresh water and nearby arable fields.
     Structure 25 is located at the southeast corner of Pueblo A.  This building contains about 30 square meters of floor space and was probably used by a larger segment of the community rather than by a few interrelated or cooperating  families.  Domestic activities were still conducted inside this structure although this aspect is still under investigation.  On the south side of the wingwall, the grinding of food and possibly other items was performed.  Although 14 manos and 6 pecking stones were stored there, only one metate was left in this part of Structure 25 when it was set ablaze.  Almost no bone byproducts, bone tools, debitage or flaked lithics were recovered south of the wingwall but 3 bone awls were evidently nested together in the ceiling immediately to the north of the wingwall (see photo above left).  A hafted axe hammer, a large core, 2-hand polishing stone and a small abrading stone were also stored in this area of the structure.  Fragments of mats and fabric were collected from the floor just north of the ventilator opening and in the east section of space just south of the wingwall.  More than 300 tree-ring samples were processed from the burned roof.  At this point in the excavation, it isn't clear if the robust artifact assemblage indicates that tools were deliberately left in the building when it was burned because they were not needed or for reasons possibly related to the ceremonial closing of the building.
     Thanks to Joel Brisbin and Gay Ives, the complex stratigraphic profiles exposed by the excavation units inside the Sector 11 great kiva were documented and photographed. As part of my research questions related to the construction of special buildings on top of earlier special buildings, an early great pit structure built in 758 A.D. was tested. During excavations in the south and west ends of the great kiva the Structure 6 over-sized pit structure was discovered. It contained approximately 65 square meters of floor space and was ceremonially closed by burning immediately after abandonment. Just as we see in Sector 7 Structure 25, a large assemblage of usable tools, fabric, human hair twine, mats, baskets, ceramic vessels and ornaments were left on the floor when the building was intentionally burned in the late 8th century. In the mid to late 900's, a great kiva was built over it and was subsequently rebuilt at least two other times before being abandoned in the 1130's or 40's. 
     In Pueblo A , an effort to emulate a construction style which had roots in Chaco is apparent in the preplanned footprint of the pueblo as well as some masonry style characteristics incorporated into some of the rooms.  The front two rows of storage rooms on the south end of the pueblo and the four storage rooms on the east side of Pueblo A were single story rooms that stood over 3 meters tall.  These rooms were added to the original configuration of the Pueblo, after the Tri Wall structure had been appended to it.  All of the remaining rooms were two stories tall.  The central kiva may have been built with rectangular rooms above it so in effect, it may have been a room that was concealed by contemporaneously used  surrounding rooms on all sides, including above it.  During the partial excavation of Room 11 in the early 1990's, a subfloor test indicates the likely presence of earlier rooms beneath it, and beneath the central kiva.  
     Another interesting item in regard to the preplanned footprint of Pueblo A is that only two of the 22 ground floor rooms were habitation rooms. They are the only square shaped rooms in the pueblo, a trait that was also found at Salmon Ruins in Bloomfield NM. The second story rooms above these two rooms were also used for domestic activities such as cooking and sleeping but were evidently not used for grinding operations.  Both the upper and lower floor rooms were directly connected via roof hatchways.  In the Summer of  2015 or 2016, the area on the west side of the west wall doorway in Room 18 will be tested to determine how that space was used. 
  Kiva A has been a fascinating bit of discovery. Some of its masonry is of a finer style than appears to be the norm at Mitchell Springs. Like Room 18, Kiva A also burned in a cataclysmic fire that ended the occupation of Pueblo A and possibly the entire Mitchell Springs Community. It has no southern recess which is not the norm for kivas built and used during this time period in the Montezuma Valley.  In the space that is often reserved for a southern recess, an elaborate ventilator feature was engineered and constructed. This feature brought fresh air down into the kiva chamber from either the floor of the room above it or from atop Pueblo A.  The pressure differential between the dark spaces in Kiva A in the belly of the pueblo, to the sunlit intake point 20 feet above (on the roof of Pueblo A), would have created a natural circulating cooling effect in the summer months.  Regulating the airflow into the ventilator would prevent too much cold air from entering during cold nights.  On one of the masonry stones that was used to create the elaborated ventilator feature (see photo below Left), an interesting petroglyph was carved.
​     A very thin bench was located and a test to confirm it was indeed present removed a 4-5 cm thick section of the plaster that had been applied to the bench and bench back. This revealed 20 different layers that ranged in color from bright white to red to gray. Next season the bench will be be uncovered and we should get a look at some of the Kiva A floor.  It'll be a gas.

See Mitchell Springs Tab for more information on this work.......

Structure 25 was burned at abandonment with tools, vessels and other objects on the floor.  Sage was used as an accelerant to help get the initial fire hot. Moccasin Gray jar was broken by falling roof beams
Eastern Illinois University Geology and GIS Class working at Mitchell Springs with Mesa Verde in background.
​20 layers of different colored plaster was coated on the top and back of the bench.  A bright white was the most common of these but red and gray were also used.  Arrow is laying on bench and is 15 cm long.
Structure 25, immediately north of the east side of wingwall.  These 3 awls must have been someone's favorite tools.  Oils from the users hands and the materials under being processed or constructed created a beautiful patina on these instruments.

Mitchell Springs Sector 11 great kiva (west end). Note complex stratigraphy evident in excavation unit walls. These fill layers contained hundreds of beads and other completely functional tools and projectile points suggesting their use as offerings.
From Pueblo A looking west toward the Sleeping Ute Mtn. Ain't she
Fall is a beautiful time to be in the Four Corners area.  View from the center of the Mitchell Springs Community looking toward Mesa Verde.
2015 Field School Dates Have Been Set
    July 31- August 3                     August 14-17                 September 11-14
Class sizes will be reduced this year so if you need specific dates, act quickly and send us a note to sign up.
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