We thank L. Kopeck, Czech Geological Survey, Prague, for valuable discussion and advice on the geology of the Doupov Mountains; M. Böhme, Paleontological Institute of the University in Munich, who discovered the peculiar fossiliferous lens that appears to be a remnant of a termitarium and for advice on the taphonomy of Detan; and J. Prokop, Institute of Biology, Department of Entomology, Charles University, Prague, for discussions about insect taphonomy. We thank E.H. Lindsay for discussions and language corrections. We also thank L.J. Flynn and L.L. Jacobs for helpful reviews, and we appreciate being invited to contribute to this volume in honor of W. Downs. Field research was supported in 1965-1989 by the Czechoslovak Geological Survey, and since 1990, by the Northbohemian Brown Coal Mining Company in Chomutov.