There is an interesting paper about the tracks of footprints of birds, 
pterosaurs,
dinosaurs found below the K/Pg boundary in the Las Encinas Formation, State
of Coahuila, Mexico. Although it is in Spanish, a more or less usable 
translation
can be obtained using document option of Goggle Translate at
https://translate.google.com/?hl=en&sl=auto&tl=en&op=docs

The open access paper is:

Serrano-Bra?as, C., Espinosa-Ch?vez, B., Flores-Ventura, J., 
Barrera-Guevara,
D., Torres-Rodr?guez, E., Cadena-Gonz?lez, D., and Vega, F.J., 2024. 
Huellas
de aves, pterosaurios, dinosaurios y el l?mite K/Pg en Coahuila, M?xico
(Footprints of birds, pterosaurs, dinosaurs and the K/Pg limit in Coahuila,
Mexico). Revista-Maya-Geociencias, Febrero 2024. pp. 96-105.
https://revistamaya.com/wp-content/uploads/2024/02/Revista-Maya-Geociencias-Febrero-2024.pdf
https://revistamaya.com/?page_id=73

PDFs of more issues of Revista Maya Geociencia at
https://revistamaya.com/?page_id=73

A related paper is:

Serrano-Bra?as, C.I., Espinosa-Ch?vez, B., Ventura, J.F., Barrera-Guevara,
D., Torres-Rodr?guez, E. and Vega, F.J., 2022. New insights on the avian
trace fossil record from NE Mexico: evidences on the diversity of latest
Maastrichtian web-footed bird tracks. Journal of South American Earth
Sciences, 113, p.103686.

Yours,

Paul H.