Thomas William Rhys Davids in his Buddhist India (p. 188) has given a chronological table of Buddhist literature from the time of the Buddha to the time of Ashoka which is as follows:
1. The simple statements of Buddhist doctrine now found, in identical words, in paragraphs or verses recurring in all the books.
2. Episodes found, in identical words, in two or more of the existing books.
3. The Silas, the Parayana, the Octades, the Patimokkha.
4. The Digha, Majjhima, Anguttara, and Samyutta Nikayas.
5. The Sutta-Nipata, the Thera-and Theri-Gathas, the Udanas, and the Khuddaka Patha.
6. The Sutta Vibhanga, and Khandhkas.
7. The Jatakas and the Dhammapadas.
8. The Niddesa, the Itivuttakas and the Patisambbhida.
9. The Peta and Vimana-Vatthus, the Apadana, the Cariya-Pitaka, and the Buddha-Vamsa.
10. The Abhidhamma books; the last of which is the Katha-Vatthu, and the earliest probably the Puggala-Pannatti.
Thomas William Rhys Davids was a past president of the Pali Text Society, scholar, Pali translator, and husband of the great Pali translator, Caroline A. F. Rhys Davids (who was also president of the Pali Text Society for some years).