A sumatralith is an

oval An oval () is a closed curve in a plane which resembles the outline of an egg. The term is not very specific, but in some areas (projective geometry, technical drawing, etc.) it is given a more precise definition, which may include either one ...

rectangular In Euclidean plane geometry, a rectangle is a quadrilateral with four right angles. It can also be defined as: an equiangular quadrilateral, since equiangular means that all of its angles are equal (360°/4 = 90°); or a parallelogram containin ...

shaped

stone In geology, rock (or stone) is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is categorized by the minerals included, its Chemical compound, chemical composition, and the way in which it is formed. Rocks ...

artefact made by unifacially flaking around the

circumference In geometry, the circumference (from Latin ''circumferens'', meaning "carrying around") is the perimeter of a circle or ellipse. That is, the circumference would be the arc length of the circle, as if it were opened up and straightened out t ...

of a

cobble Cobble may refer to: * Cobble (geology), a designation of particle size for sediment or clastic rock * Cobblestone, partially rounded rocks used for road paving * Hammerstone, a prehistoric stone tool * Tyringham Cobble, a nature reserve in Tyr ...

. It is often used to infer the

Hoabinhian Hoabinhian is a lithic techno-complex of archaeological sites associated with assemblages in Southeast Asia from late Pleistocene to Holocene, dated to c.10,000–2000 BCE. It is attributed to hunter-gatherer societies of the region and their ...

character of a lithic assemblage.

References

* Nishimura M. 1994. Attribute analysis of the Hoabinhian industry: Implications from a comparative study of Bung cave and Xom Trai cave, Northern Vietnam. ''Vietnam Social Sciences'' 5: 75-87 * Van Tan, H. A. (1997). The Hoabinhian and before. Bulletin of the Indo-Pacific Prehistory Association, 16, 35–41. Lithics {{archaeology-stub