For the Cretaceous part I would suggest:

- Kirillova GL, Markevitch VS, and Belyi VF. 2000. Cretaceous environmental changes of East Russia. In: Okada H, Mateer NJ. (eds.), Cretaceous Environments of Asia, Elsevier Science B.V., p. 1-47

- Morley RJ. 2011. Cretaceous and Tertiary climate change and the past distribution of megathermal rainforests. In: Bush M, Flenley J, Gosling W. (eds.), Tropical Rainforest Responses to Climatic Change. Berlin Heidelberg (Germany), Springer. pp. 1-34 http://link.springer.com/chapter/10.1007/978-3-642-05383-2_1

There are also a couple of older papers from the 70s about paleobotany in East Asia (mostly Russia though) that dabble into climate reconstruction. Some should be referenced in the Kirillova et al. paper.

I hope this helps.

Thank you, Jens. Very helpful, especially the one by Morley. I will look into more articles you suggested soon.

Thank you very much, Kale! 

Malaysia, and SE Asia in general, has been very near the Equator for more than 100 million years (see Atlas link below).  Consequently, The clim ate has always favored a everwet, tropical rainforest ecosystem.

https://www.researchgate.net/publication/266476284_Atlas_of_Late_Cretaceous_Paleogeographic_Maps_PALEOMAP_Atlas_for_ArcGIS_volume_2_The_Cretaceous_Maps_16_-_22_Mollweide_Projection_PALEOMAP_Project_Evanston_IL

Technical Report Atlas of Late Cretaceous Paleogeographic Maps, PALEOMAP Atla...