according the photograph this is a fossil wood, in cross section. It is altered, and probably hyperblastic, i.e. each crystal includes several tracheids. At crystal margins the tracheids are more altered / deformed, hence the reticulate aspect. I already observed such pattern several times in Jurassic fossil wood, and illustrated it in my 1991 thesis. This seems to be a conifer wood, with narrow rings.

marc

Some questions:

What is the environment of the lacustrine basin like?

Is this a thin section under ppl or crossed polars or polished section?

Which are the associated minerals that you could identify with certainty?

What is the whitish matter at the edge of the image?

HGD

Despite the wood disorganization by hyperblastia i think that the radial direction is parallel to the shorter side of the picture. Could you arrange another other thin-section to be prepared, perpendicular to the picture plan and parallel to this shorter side? Such is necessary in order to be abble to determin softwoods. It might give interesting palaeoecological and or palaeobiogeographical information, all the morer Jurassic fossil wood is poorly documented from Sichuan. You might also want to contact colleagues in China like Tian Ning in Shenyang (Liaoning) or Wang Yongdong in Nanjing.

Geometric cells are observed that are usually typical of the parenchyma of a plant

1.What is the environment of the lacustrine basin like?

In the source interval of the sample, the lake water body is shallow, the terrigenous input is weak, and a large number of carbonate rocks and shell limestones are developed.

2.Is this a thin section under ppl or crossed polars or polished section?

The samples were observed using plane polarized light, and a large number of biological shell debris can be observed under the microscope. Occasionally, black areas (possibly organic matter) of different shapes and sizes can be seen between the debris particles, while the reticulated fossils in the picture developed in this black area.

3.Which are the associated minerals that you could identify with certainty?

According to my obser@@vation, it is surrounded by shell debris, the interior of the shell is filled with recrystallized calcite, and the space between the shells is supposed to be micrite dolomite.

4.What is the whitish matter at the edge of the image?

The white material on the edge of the picture is the shell debris filled with bright calcite.@Harald G. Dill

Thank you so much, It is really useful for me. I'm going to read more related literature. At present, in other samples, I have not found similar phenomenon, but I am still observing. Below are photos I took from different angles.@Marc Philippe

Thank you very much for your reply, your answer helped me a lot.@José Francisco Carrasco

thanks for the news views

sorry it does not add much from wood point of view

it is a tracheidoxyl, i.e. a homoxylous wood, possibly that of a conifer

Apparently several shells get attached to this wood

see comments on the picture

you can use marc.philippeATuniv-lyon1.fr if you want to discuss further

marc

Thank you very much for your answer, I am not very familiar with this area, but your answer guided me very well. I will look up more information to understand it.@Marc Philippe

Erejep