![Bedrock mortar in a rock shelter on the Upper Cumberland Plateau](https://upload.wikimedia.org/wikipedia/commons/4/4c/Bedrock_mortar_in_a_rock_shelter_on_the_Upper_Cumberland_Plateau.jpg)
A bedrock mortar (BRM) is an
anthropogenic
Anthropogenic ("human" + "generating") is an adjective that may refer to:
* Anthropogeny, the study of the origins of humanity
Counterintuitively, anthropogenic may also refer to things that have been generated by humans, as follows:
* Human im ...
circular depression in a rock
outcrop
An outcrop or rocky outcrop is a visible exposure of bedrock or ancient superficial deposits on the surface of the Earth.
Features
Outcrops do not cover the majority of the Earth's land surface because in most places the bedrock or superficial ...
or naturally occurring slab, used by people in the past for grinding of
grain
A grain is a small, hard, dry fruit (caryopsis) – with or without an attached hull layer – harvested for human or animal consumption. A grain crop is a grain-producing plant. The two main types of commercial grain crops are cereals and legum ...
,
acorn
The acorn, or oaknut, is the nut of the oaks and their close relatives (genera ''Quercus'' and '' Lithocarpus'', in the family Fagaceae). It usually contains one seed (occasionally
two seeds), enclosed in a tough, leathery shell, and borne ...
s or other food products. There are often a cluster of a considerable number of such holes in proximity indicating that people gathered in groups to conduct food grinding in
prehistoric
Prehistory, also known as pre-literary history, is the period of human history between the use of the first stone tools by hominins 3.3 million years ago and the beginning of recorded history with the invention of writing systems. The use of ...
cultures. Correspondingly the alternative name gossip stone is sometimes applied, indicating the social context of the food grinding activity. Typical dimensions of the circular indentations are approximately 12 centimeters in diameter by 10 centimeters deep, although a considerable range of depths of the cavities have been documented . The bedrock mortar has been identified in a number of world regions, but has been particularly intensely documented in the
Americas
The Americas, which are sometimes collectively called America, are a landmass comprising the totality of North and South America. The Americas make up most of the land in Earth's Western Hemisphere and comprise the New World.
Along with th ...
. An alternative term for the bedrock mortar site is bedrock milling station.
Bedrock metate
A bedrock mortar should not be confused with a bedrock
metate
A metate (or mealing stone) is a type or variety of quern, a ground stone tool used for processing grain and seeds. In traditional Mesoamerican cultures, metates are typically used by women who would grind nixtamalized maize and other organic ma ...
, which is a flat,
trough
Trough may refer to:
In science
* Trough (geology), a long depression less steep than a trench
* Trough (meteorology), an elongated region of low atmospheric pressure
* Trough (physics), the lowest point on a wave
* Trough level (medicine), the l ...
-shaped depression often found with bedrock mortars.
Example locations of occurrence
*Southern
Arizona
Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Fou ...
: In the
Santa Catalina,
Santa Rita,
Rincon,
Sierrita, and
Tucson Mountains
The Tucson Mountains (O'odham: Cuk Doʼag) are a minor mountain range west of Tucson, Arizona. The Tucson Mountains, including Wasson Peak, are one of four notable mountain ranges surrounding the Tucson Basin. The Santa Catalina Mountains lie ...
, and also in rock outcroppings in the valleys
*Along the north banks of the middle reaches of the
Merced River
The Merced River (), in the central part of the U.S. state of California, is a -long tributary of the San Joaquin River flowing from the Sierra Nevada (U.S.), Sierra Nevada into the San Joaquin Valley. It is most well known for its swift and st ...
in
Mariposa County, California
Mariposa County () is a county in the U.S. state of California. As of the 2020 U.S. Census, the population was 17,131. The county seat is Mariposa. It is located in the western foothills of the Sierra Nevada mountains, north of Fresno, east of ...
,
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
*In
Santa Barbara and
San Luis Obispo
San Luis Obispo (; Spanish for " St. Louis the Bishop", ; Chumash: ''tiłhini'') is a city and county seat of San Luis Obispo County, in the U.S. state of California. Located on the Central Coast of California, San Luis Obispo is roughly halfwa ...
counties on the California Central Coast
*In northern
Mexico
Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatema ...
within the Sierra
Tarahumara of Southern
Chihuahua
*The Upper
Cumberland Plateau
The Cumberland Plateau is the southern part of the Appalachian Plateau in the Appalachian Mountains of the United States. It includes much of eastern Kentucky and Tennessee, and portions of northern Alabama and northwest Georgia. The terms "Alle ...
of
Tennessee
Tennessee ( , ), officially the State of Tennessee, is a landlocked state in the Southeastern region of the United States. Tennessee is the 36th-largest by area and the 15th-most populous of the 50 states. It is bordered by Kentucky to th ...
, United States
*Inside many rock shelters in
Menifee County, Kentucky
Menifee County is a county located in the U.S. state of Kentucky. As of the 2020 census, the population was 6,113, making it the fifth-least populous county in Kentucky. Its county seat is Frenchburg. The county is named for Richard Hickman M ...
, United States
*The Cueva de los Corrales region of northwestern
Argentina
Argentina (), officially the Argentine Republic ( es, link=no, República Argentina), is a country in the southern half of South America. Argentina covers an area of , making it the second-largest country in South America after Brazil, th ...
[M. Del Pilar Babot, María C. Apella, ''Maize and Bone: Residues of Grinding in Northwestern Argentina'', Archaeometry, Volume 45 Issue 1 Page 121-132, February 2003]
Gallery
File:Garrod's terrace el-Wad.jpg, Natufian
The Natufian culture () is a Late Epipaleolithic archaeological culture of the Levant, dating to around 15,000 to 11,500 years ago. The culture was unusual in that it supported a sedentary or semi-sedentary population even before the introduction ...
bedrock mortars at Mount Carmel
Mount Carmel ( he, הַר הַכַּרְמֶל, Har haKarmel; ar, جبل الكرمل, Jabal al-Karmil), also known in Arabic as Mount Mar Elias ( ar, link=no, جبل مار إلياس, Jabal Mār Ilyās, lit=Mount Saint Elias/Elijah), is a c ...
, Israel.
File:Muidu bedrock mortars.jpg, Maidu
The Maidu are a Native American people of northern California. They reside in the central Sierra Nevada, in the watershed area of the Feather and American rivers. They also reside in Humbug Valley. In Maiduan languages, ''Maidu'' means "man."
...
bedrock mortars in northern California.
File:AnzaMorterosByPhilKonstantin.jpg, Bedrock mortars at the Anza-Borrego Desert State Park
Anza-Borrego Desert State Park (, '' AN-zə bə-RAY-goh'') is a California State Park located within the Colorado Desert of southern California, United States. The park takes its name from 18th century Spanish explorer Juan Bautista de Anza and ...
in southern California.
File:Acorn grinding stone-750px.jpg, Bedrock mortars used to grind acorn
The acorn, or oaknut, is the nut of the oaks and their close relatives (genera ''Quercus'' and '' Lithocarpus'', in the family Fagaceae). It usually contains one seed (occasionally
two seeds), enclosed in a tough, leathery shell, and borne ...
s in California.
File:Indian_Kitchen_Bedrock_Mortars_2013.jpg, Hohokam
Hohokam () was a culture in the North American Southwest in what is now part of Arizona, United States, and Sonora, Mexico. It existed between 300 and 1500 AD, with cultural precursors possibly as early as 300 BC. Archaeologists disagree about ...
bedrock mortars at Indian Kitchen, Arizona.
File:Huerfano Butte Arizona Bedrock Mortars Number 1.jpg, Bedrock mortars at Huerfano Butte
Huerfano Butte (; ) is a volcanic plug or hypabyssal plug located north of Walsenburg in Huerfano County, Colorado, United States. Named ''Huérfano'' (English: orphan) by early Spanish explorers, it rises above the south side of the Huerfano ...
.
File:Huerfano_Butte_Arizona_Bedrock_Metate.jpg, A close up view of a bedrock metate at Huerfano Butte.
See also
*
Grinding slab
250px, Stone slab in east-central California used to grind acorns
In archaeology, a grinding slab is a ground stone artifact generally used to grind plant materials into usable size, though some slabs were used to shape other ground stone artifa ...
*
Mano
Mano may refer to:
People
* Mano people, an ethnic group in Liberia
* Mano (name), a list of people with either the given name or surname
* Mano (Mozambican footballer) (born 1984), real name Celso Halilo de Abdul
* Mano (Portuguese footballer) ...
*
Metate
A metate (or mealing stone) is a type or variety of quern, a ground stone tool used for processing grain and seeds. In traditional Mesoamerican cultures, metates are typically used by women who would grind nixtamalized maize and other organic ma ...
*
Mortar and pestle
Mortar and pestle is a set of two simple tools used from the Stone Age to the present day to prepare ingredients or substances by crushing and grinding them into a fine paste or powder in the kitchen, laboratory, and pharmacy. The ''mortar'' () ...
Line note references
{{DEFAULTSORT:Bedrock Mortar
Food preparation utensils
Archaeological features
Food grinding tools