Palanisamy appeared at Keezhavalavu police station after he was summoned for questioning, police said.
ADSP Mariappan and DSP Mangaleswaran are questioning him, police said.
Police had issued summons to Palanisamy and three others.
Two of the firm's employees -- Manager of PRP Granites, Ayappan and quarry-in-charge Jothibasu were questioned two days ago.
IAS officer U Sagayam, appointed by Madras High Court as Legal Commissioner to probe "illegal" granite quarrying in this district, had ordered digging of some sites following allegations of human sacrifice.
The complaint was given by one of the drivers of heavy machinery working with the PRP granite export company, retired ADSP Velu, assisting Sagayam in his investigations, had said.
A case had been registered against Palanisamy and some others last week but the company had denied the allegation.
The skeletons recovered were that of a baby and three men. While skeletons of two men were recovered on September 13 that of the baby and another man were recovered in the early hours of Monday.
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