A few years back (2018) I did a column about the engraved ocher fragments from Blombos Cave (see references below). The column was ostensibly about these markings being, at that time, considered possibly the oldest petroglyphs known, but in it I suggested that possibly the grooves were to improve the grip like the checkering on a rifle stock. Sylvia Stein (2025, 2026) has proposed that the engraving on the piece of ocher is actually a picture of a fishnet.
“The invention of string, thus, is the essential tool in the fishing net with shell weights (100,000 kya to 74,000 kya), preceding the invention of the bow and arrow (60,000 kya).The use-wear studies of the punctured Blombos Nassarius shells have clearly established that the shells were strung either loosely or knotted, perhaps for quick horizontally stringed shells replacement on nets for mass fishing, before the invention of the bow and arrow hunting a single prey. Thus, essential, is that use-wear studies indicate that the dull Nassarius perforated shells were strung not in a curve or loop for functions as a bracelet, or necklace, though horizontally as a string of shell weights to be affixed to the bottom of a fishing net. Our argument then heavily relies on these use-wear studies of shells horizontally on a string, essential to making fishing nets, preceding bow and arrow in brain evolution.” (Stein and Pacheco 2025:33) So, in this thesis the pierced shells found in Blombos Cave are not for ornamental use as in a necklace or a bracelet, but are pierced to be tied on to the bottom of the net as net weights.
Stein, Chukhman and Makhin (2026) revisit that thesis with complicated analysis and statistical studies. In the end their conclusion is that “the implications are the occupants of the MSA BBC not only had intellectual capacities to design, record, make and re-use string based nets, they had developed superior finger dexterity with refined engineering net construction capacities.” Possible, but what would statistics have to do with this question.
Now, I suppose that this could represent the design of a fishnet, however, if I was diagramming a fishnet I believe I would have done it in larger scale – feet instead of inches. Additionally, I do not see any representations of weights at the bottom junctions of the supposed net engraving.
An online page at 'Wikipedia-Nassarius' discusses "several 75,000-year-old Nassarius kraussianus beads which were found at Blombos Cave, South Africa (including some colored with red ocher). These beads have previously been thought to be the oldest examples of jewelry." (Wikipedia) The jewelry theory has certainly been the most common interpretation of these pierced shells for quite some time.
Nassarius shells come from a species of marine snail and have a coiled shell like other snails. It seems inevitable with the coiled structure of a snail shell some air will be trapped inside when thrown into the water, thus possibly causing it to float which would not make a great net weight. Now I certainly cannot say for certain, but I must go with being a skeptic on the Stein, Chukhman and Mahkin’s theory.
But, back
to the ocher itself – checkering for a better grip, or just decoration seem to
be the most satisfying conclusion.
NOTE: Some images in this column were retrieved from the internet with a search for public domain photographs. If any of these images are not intended to be public domain, I apologize, and will happily provide the picture credits if the owner will contact me with them. For further information on these reports you should read the original reports at the sites listed below.
REFERENCES:
Faris, Peter, 2018, Oldest Petroglyphs So Far?, 25 August 2018, RockArtBlog, https://rockartblog.blogspot.com/2018/08/oldest-petroglyphs-so-far.html.
Stein, Silvia F., Morris Chukhman and Sergii Makhin,2026, Establishing a Functional Use for the MSA Engraved Blombos Ochre Through Image-Based Vectorization, Use-Wear Constraints, and Experimental Reconstruction, Paper from 2026 CAA Conference. Accessed online through Academia on 22 April 2026.
Stein, Silvia and Susana Pacheco, 2025, Did fishing nets with calculated shell weights precede the bow and arrow? Applied Mathematics and Sciences: An International Journal (MathSJ), Vol. 12, no. 2. Accessed online through ResearchGate on 22 April 2026.
Wikipedia, Nassarius, https://en.wikipedia.org/wiki/Nassarius.
Accessed online 26 April 2026.