The Shiva Purana mentions the following -
The Śaiva Āgama is of two varieties: Śrauta (Vedic) and Aśrauta (Unvedic). The Śrauta consists of condensed Vedic texts; the other one consists of independent texts but well consecrated.
The independent texts were originally ten but supplemented subsequently by eight more so as to constitute eighteen texts. They are called Kāmika etc., and the entire literature is called “Śaiva Siddhānta”
The Śrauta literature consists of a billion verses. In it the Pāśupata Vrata and Jñāna are explained.
Which Srauta (Vedic) Saivagama is being alluded to in these verses?