"thus appeared" is correct and usable in written English.
You can use it to indicate the sudden appearance of something. For example, "Suddenly, a mysterious figure thus appeared in the dark alleyway."
My right hand thus appeared to be my left".
The secretary's comments thus appeared to give support to Mr. Arafat.
A limited-edition run of "Ideas of Order," Stevens's second book of poems, thus appeared in 1935.
It thus appeared to go along with the withdrawal without actually saying so.
A Rose-tinted viewFlexible currencies thus appeared to have lightened the yoke of dollar imperialism.
The United States and the Soviet Union thus appeared to pose asymmetrical threats to each other.
This received the support of several others on the council, and it thus appeared that the council would not be reduced to a sham.
But their magnanimity coincided with the $15 billion government bailout for the industry and thus appeared to be a sort of quid pro quo.
To many overseas observers, Mr Bush thus appeared to be invoking a doctrine of pre-emptive war.
The quiz papers were unnumbered and thus appeared to be untraceable, and were thrown away at the end of the study.
Vessel wall thus appeared as "see-saw" artefact (Fig. 1).
