Context: Recently, a peculiar type of rock-cut cave from the Megalithic period (800 BC to 500 BC) has been found at a government cashew plantation at Aturu-Kundaje near Ramakunja, Kadaba taluk in Dakshina Kannada.
Why is it Unique?

• "Usually, Megalithic burial sites are marked by stone circles and menhirs. But in the cave found near Ramakunja, a sepulcher is marked by a circle or zero. It brings up interesting questions like did the Megalithic people know about zero?" he said.

Key findings

• No grave articles were found inside the cave.
• Small pieces of red, black, and red pottery were found in small quantities in the cave.
• In this cave, there is no central opening.
• A huge engraving of a circle of about 7 feet in diameter is found above the laterite surface and exactly below this in the same dimension, is a hemispherical cave with a side opening of about 2 feet in height.
• The megalithic culture was the dominant one in south India.
• Megalithic burial sites are marked by stone circles and menhirs.