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In page Udayagiri Caves:

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The temple sanctum is dedicated to Shiva, with the sanctum containing an ekamukha linga, or a linga with a face carved on it. Outside its entrance, in what was a mandapa and now is eroded remnants of a courtyard are matrikas (mother goddesses), eroded likely because of weathering. This is one of the three groups of matrikas found at Udayagiri site in different caves. The prominent presence of the matrikas in a cave dedicated to Shiva suggests that the divine mothers had been accepted within the Shaivism tradition by about 401 CE.[2] Some scholars speculate that there may have been Skanda here, but others state the evidence is unclear.[2]