Monks Mound

Monks Mound (HM168E)

Location: Collinsville, IL 62234 Madison County
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Country: United States of America
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N 38° 39.545', W 90° 3.666'

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The largest prehistoric earthwork in the Americas

Monks Mound is the largest prehistoric earthwork in the Americas. Its base covers over 14 acres, and it rises to a height of 100 feet. It contains an estimated 22 million cubic feet of earth, all hand-carried in baskets from the many borrow pits through the Cahokia site.

It was not built all at once. But in a series of stages, mostly from AD 950-1200. Core-drillings through the mound suggest eight to 14 building stages. Excavations at various locations found indications of a stairway on the South Ramp; several buildings and a small mound rebuilt eight times on the First Terrace; a large temple structure on the Fourth Terrace; evidence of a French chapel and historic Indian occupation (1730s) on the First Terrace; and the discovery of the Birdman Tablets on the east side of the mound.

Recent tests confirm that the First Terrace was a late addition to the front of the mound and drilling deep beneath the Second Terrance encountered a large mass of stone cobbles whose function is unknown at this time. The Mississippians were also doing soil engineering, selecting and placing specific soils for strength or drainage.

It is called Monks Mound because a group of French Trappist Monks lived on a nearby mound from 1809-1913 and planted gardens, fruit trees and wheat on the terraces of this mound.

(Lower Left Image Caption)
The "Birdman Tablet" was discovered in excavations on the east side of Monks Mound in 1971. The front side of this engraved sandstone tablet depicts a man in a "falcon dancer" outfit, with a beaked mask and wing; the reverse side has a cross-hatched diamond patterns representing a snake.

(Upper Center Illustration Caption)
???The Fourth Terrace building was probably the residence of the leader and the religious/political focus of this urban center. A fenced courtyard with a huge post in the center, enclosed the fourth terrace.
???In the 1830s Amos Hill built his farm complex on the Third Terrace and removed a small mound on the southeast corner. He is buried on the northwest corner of the Fourth Terrace.

(Lower Center Illustration Caption)
The paramount chief and his attendants greet the rising sun from the top of Monks Mound. Among some later Mississippian peoples in the Southeast the chief was believed to be related to the Sun and that may have been true at Cahokia as well.

(Upper Center Map Caption)
Excavation map of the last temple on the fourth terrace—with courtyard, fence, and large post AD 1150
Mound Facts
- The base covers an area of over 14 acres.
- It is 100 feet at the highest point.
- It contains 22 million cubic feet of earth.
- The building on the top terrace measured 48 feet by 104 feet and possibly 50 feet high.
- Construction of the mound began around AD 950, and it was enlarged several times until AD 1250.
HM NumberHM168E
Placed ByCahokia Mounds State Historic Site
Marker ConditionNo reports yet
Date Added Friday, September 12th, 2014 at 2:50am PDT -07:00
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Locationbig map
UTM (WGS84 Datum)15S E 755726 N 4283044
Decimal Degrees38.65908333, -90.06110000
Degrees and Decimal MinutesN 38° 39.545', W 90° 3.666'
Degrees, Minutes and Seconds38° 39' 32.70" N, 90° 3' 39.96" W
Driving DirectionsGoogle Maps
Area Code(s)618
Closest Postal AddressAt or near 6085-6399 Monks Mound Trail, Collinsville IL 62234, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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