. The Canadian field-naturalist. Figure 2. Circular, collapse sinkhole at 60°12' N latitude and 113°42i/2' W longitude indicated in Figure 1. June 24, 1972. surface drainage in the above two lake zones is well developed, it is very poorly developed in the sink- hole zone, with the sinkhole lakes usually lacking surface inlets or outlets. Fishes have not been found in all sinkhole lakes. The most convincing case found of inferred un- derground movement of fishes is that of a sinkhole in the Klewi system at 60°12' N, 113°42V2' W (Figure 1). This sinkhole is approximately 45 m (150 feet) by 30 m
. The Canadian field-naturalist. Figure 2. Circular, collapse sinkhole at 60°12' N latitude and 113°42i/2' W longitude indicated in Figure 1. June 24, 1972. surface drainage in the above two lake zones is well developed, it is very poorly developed in the sink- hole zone, with the sinkhole lakes usually lacking surface inlets or outlets. Fishes have not been found in all sinkhole lakes. The most convincing case found of inferred un- derground movement of fishes is that of a sinkhole in the Klewi system at 60°12' N, 113°42V2' W (Figure 1). This sinkhole is approximately 45 m (150 feet) by 30 m (100 feet), with the long axis lying in a northwest-to-southeast direction (Figure 2). The sides consist of much loose material and the central area is filled in with material which was solid enough to walk on. The maximum depth from top to the water level is about 18 m (60 feet). At the southeast end (lower left in Figure 2), closest to the Klewi River, is a small opening which was not investigated by us, while a readily accessible pool exists in a tunnel-like entrance at the northwest end (top center in Figure 2). Light breezes brought down a shower of fine dust particles into the water, but most of the pool was under a ledge. No rooted aquatic plants were visible and no currents were detectable. It was in the northwest pool (Figure 3) .^^M^-i^^Tr*'"^. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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