Gajiganna A
Basic information
Sample name: Gajiganna A

Reference: P. Breunig, K. Neumann, and W. Van Neer. 1996. New research on the Holocene settlement and environment of the Chad Basin in Nigeria. African Archaeological Review 13(2):111-145 [ER 3367]
Country: Nigeria

Coordinate: 12° 16' N, 13° 13' E
Basis of coordinate: estimated from map
Geography comments: "80 km north of Konduga"
"The upper part of the meter-thick main cultural layer... is dated to 2960 B.P. 50 years (1286-1022 CalBc, UtC-2795)... The lower cultural lauyer, only some 20 cm thick, is dated to 2930 B.P. 60 years (1236-1009 CalBC, UtC-2329)"
Climate and habitat
Lithology: claystone
Taphonomic context: human accumulation
Archaeology: bone tools, buildings, burials, ceramics, hearths, stone tools
Habitat comments: a low mound "around 2 m in height and 150 m in diameter... surrounded by clay flats"
"about 2 m of deposits... The sediment in these layers consists largely of clay... we assume that the clay was brought onto the site by the inhabitants in the form of mud-bricks or, more probably, daub for houses" and there is "well-preserved organic material: pollen, animal bones, and charcoal"
"graves are confined to the upper cultural layer of Gajiganna A" and there is abundant pottery plus some lithic artefacts including grinding stones, stone axes, adzes, chisels, and arrowheads, plus bone artifacts including harpoons and clay figurines
Life forms: carnivores, primates, rodents, ungulates, birds, turtles, fishes, clams, snails
Sampling methods: quarry
Sample size: 1484
Sampling comments: a "5 x 5-m" trench was excavated "at the highest point" of the mound
Sample: 3724
Contributor: John Alroy
Enterer: John Alroy
Created: 2020-12-02 13:12:19
Modified: 2020-12-02 15:04:00
Abundance distribution
31 species
10 singletons
total count 1484
standardised richness: not computable
Fisher's α: 5.542
geometric series k: 0.7985
Hurlbert's PIE: 0.5961
Shannon's H: 1.3502
Good's u: 0.9933