<ref name="Loewen_et_al_2024">{{cite journal |first1=E. J. T. |last1=Loewen |first2=M. A. |last2=Balkwill |first3=J. |last3=Mattioli |first4=P. |last4=Cockx |first5=M. |last5=Velez Caicedo |first6=K. |last6=Muehlenbachs |first7=R. |last7=Tappert |first8=A. |last8=Borkent |first9=C. |last9=Libke |first10=M. S. |last10=Engel |first11=C. |last11=Somers |first12=R. C. |last12=McKellar |year=2024 |title=New Canadian amber deposit fills gap in fossil record near end-Cretaceous mass extinction |url=https://antcat.org/documents/8618/loewen_etal_2024_canadian_maastrichtian_big_muddy_amber.pdf |journal=Current Biology |publisher= |volume=34 |issue= |pages=1762–1771 |doi=10.1016/j.cub.2024.03.001 }}</ref>