Earlier theories, most notably the BGS publication "Lizard & the Meneage" that summarised thinking up to the point of publication, proposed that the serpentinite body represented an intruded mass of ultra-mafic material.
Prior hypotheses, notably the BGS publication "Lizard & the Meneage," which outlined ideas up to its release, suggested that the serpentinite body was a mass of ultra-mafic rock that had been intruded into the existing structure.