Yixian Trees

Does anyone know of any data (published or otherwise) on tree trunk diameters from the Yixian Formation?

I know many silicified trunks have been collected, and I have read the data on the occurrences of fossil wood
taxa. But none that I've read mention the diamters. That would be  a first step toward figuring out the
canopy structure. I am thinking in terms of emergents, canopy, and sub canopy plants.

Interestingly, most extant conifer families have members that span from prostrate ground covers to 50
meter canopy trees. Thus foliage alone is of little use in determining whether different taxa were tall or short.

There is the excellent paper:

Howard J. Falcon-Lang and David J. CantrillTerrestrial paleoecology of the Cretaceous (early Aptian)
Cerro Negro Formation, South Shetlands Islands, Antarctica; a record of polar vegetation in a volcanic
arc environment
Palaios(October 2002)

Which suggests that some Early Cretaceous forests had araucarians and podocarps as the canopy trees. But
Yixian also had cheirolepids which, in other habitats, can have trunks 70cm in diameter. I wonder if they
could have been emergents.

Also is anyone familiar with this paper?

Journal of Precious Metallic Geology》 2003-01
STUDY ON THE PALEOECOLOGY OF YIXIAN FORMATION IN BEIPIAO AREA, WESTERN LIAONING PROVINCE, CHINA DING
Qiu-hong, ZHANG Li-dong, GUO Sheng-zhe, ZHANG Chang-jie, PENG Yan-dong, JIA Bin, CHEN Shu-wang, XING
De-he (1. Institute of Resources and Civil Engineering, Northeast University, Shenyang 110004, China;
2. Shenyang Institute of Geology and Mineral Resources, Shenyang 110033, China)  

It suggests four communities based on two diagnostic taxa each, but the abstract does not mention the
distribution of several other common tree species in the Yixian Formation. I assume that the text is only