450 C.E. PROCLUS - THE ELEMENTS OF THEOLOGY

Proclus’ description of the physical world owes much to the Timaeus. Jan Opsomer stresses that this dialogue is interpreted as giving a hypothetical picture of physical nature, which is characterized with a degree of indeterminacy and lacking the perfection that its causes have. Genuine causes are incorporeal ( El. Theol. § 80), just like qualities. Most interesting is the discussion of ‘geometric atomism’ according to which corpuscles making up the elements are determined by geometric forms (the Platonic bodies), although one single geometric particle is not a token of the element in question.3

https://bmcr.brynmawr.edu/2018/2018.01.16#:~:text=Proclus%E2%80%99%20description%20of,in%20question.3

It is difficult to establish a chronology of Proclus’ works. The Platonic Theology is generally considered to be his last work. In writing the Theology Proclus heavily depends on his interpretation of the Parmenides and often refers to his commentary on this dialogue, which must have been finished some time before. We know from Marinus (Life of Proclus §13) that Proclus finished his Commentary on the Timaeus by the age of 27. However, it cannot be excluded that Proclus rewrote or modified it later. As the Alcibiades came at the beginning of the curriculum in the school, its commentary may also be an early work.
https://plato.stanford.edu/entries/proclus/index.html