11 February 2021 - 1° meeting. The kick-off meeting of the Berriasian Working Group served to share expertises and express opinions on issues concerning the Tithonian/Berriasian boundary and the J/K boundary interval. Beatriz Aguirre-Urreta presented data from the Neuquen Basin (Argentina).
24 March 2021 - 2° meeting. Daniela Rehakova and Silviya Petrova (invited guest) presented the state of art of calpionellid stratigraphy.
27 April 2021 - 3° meeting. Mikhail Rogov presented the Boreal J/K boundary (principles of Volgian and Ryazanian stratigraphy) and Gang Li the J/K boundary in China.
19 May 2021 - 4° meeting. Cristian Casellato and Elisabetta Erba presented the reliability of calcareous nannofossil events in the Tithonian-early Berriasian time interval and the paleoceanography and paleoclimatology of the Tethys across the Jurassic - Cretaceous Boundary interval. Ottilia Szives and I. Fozy presented new data from the Tithonian/Berriasian interval from Hungarian ammonitico rosso sections and discussed problems and possibilities of ammonite zonations.