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
[translate.google.com]

The open access paper is:

Serrano-Branas, C., Espinosa-Chavez, B., Flores-Ventura, J., Barrera-Guevara,
D., Torres-Rodriguez, E., Cadena-Gonzalez, D., and Vega, F.J., 2024. Huellas
de aves, pterosaurios, dinosaurios y el límite K/Pg en Coahuila, Mexico
(Footprints of birds, pterosaurs, dinosaurs and the K/Pg limit in Coahuila,
Mexico). Revista-Maya-Geociencias, Febrero 2024. pp. 96-105.
[revistamaya.com]
[revistamaya.com]

PDFs of more issues of Revista Maya Geociencia at
[revistamaya.com]

A related paper is:

Serrano-Branas, C.I., Espinosa-Chavez, B., Ventura, J.F., Barrera-Guevara,
D., Torres-Rodríguez, 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.

"The past is never dead. It's not even past."
William Faulkner, Act 1, Scene III, Requiem for a Nun (1951)