The Holocene Impact Working Group is an association of scientists who postulate that there were more frequent meteoric impacts on Earth in the Holocene than previously thought.  The group belong to:
Ted Bryant, geomorphologist, Wollongong University, Australia
Dallas Abbott, research scientist, Lamont-Doherty Earth Observatory, New York
Slava Gusiakov, Novosibirsk Tsunami Laboratory, Russia
Marie-Agnes Courty, Bodenkundler, European Center for Prehistoric Research, Tautavel, France
Dee Breger († 2016  ), Drexel University, Philadelphia
Bruce Masse, archaeologist, Los Alamos National Laboratory, New Mexico
Among the theses of the group is the impact of a double asteroid about 1,500 years ago off the north coast of Australia.  The HIWG uses such an underwater crater to detect the fact that meteorite impact in the oceans always causes very large tsunamis capable of flushing ocean rocks and debris particularly far into the interior of the adjacent coasts. Based on the thickness and orientation of these tsunami deposits, their origin can be pinpointed very accurately. Thus, two adjacent, crater-like structures were found at the position thus determined off the northwest coast of Australia, which were named by the HIWG Tabban (12 km in diameter) and Kanmare (18 km in diameter) and which, according to the scientists involved, are also based on mineralogical Tracks (impact glasses) gives the possibility that it could be the impact of a small double asteroid.
Grendel (North Sea, 18 km diameter), Quetzalcoatl (Caribbean, 10 km diameter), Burckle (Indian Ocean, 29 km diameter), Kangaroo (Indian Ocean, 5 km diameter), Joey (Indian Ocean, 4 km diameter) and Judge ( Long Island Sound, 1 km in diameter).