The chamber is always built in masonry, even in the earliest examples, as is the stomion or entrance-way. The dromos in early examples was usually just cut from the bedrock, as in the Panagia Tomb at Mycenae itself. In later examples such as the Treasury of Atreus and Tomb of Clytemnestra (both at Mycenae), all three parts were constructed of fine ashlar masonry.A.J.B. Wace, “Excavations at Mycenae: IX. The Tholos Tombs”, Annual of the British School at Athens 25, 1923, 283–402.
The chamber is always built in masonry, even in the earliest examples, as is the stomion or entrance-way. The dromos in early examples was usually just cut from the bedrock, as in the Panagia Tomb at Mycenae itself. In later examples such as the Treasury of Atreus and Tomb of Clytemnestra (both at Mycenae), all three parts were constructed of fine ashlar masonry.A.J.B. Wace, “Excavations at Mycenae: IX The Tholos Tombs”, Annual of the British School at Athens 25, 1923, 283–402.