"This work is not an attempt to describe the fauna of the Edwards formation, or even that of the horizon from which these specimens were collected. At present the fauna of the Edwards has received very little study, due in part to the fact that the formation is usually present as a hard crystalline limestone from which it is difficult or impossible to obtain well-preserved fossils. The preservation of the fossils at the locality described above is unusual, for the shell material has been replaced by silica, and weathering of the limestone has freed specimens which are nearly perfect in detail.... It is probable that other similar occurrences will be found in the future, and that the fauna of the Edwards will become well known" -- 266.
""This work is not an attempt to describe the fauna of the Edwards formation, or even that of the horizon from which these specimens were collected. At present the fauna of the Edwards has received very little study, due in part to the fact that the formation is usually present as a hard crystalline limestone from which it is difficult or impossible to obtain well-preserved fossils. The preservation of the fossils at the locality described above is unusual, for the shell material has been replaced by silica, and weathering of the limestone has freed specimens which are nearly perfect in detail.... It is probable that other similar occurrences will be found in the future, and that the fauna of the Edwards will become well known" -- 266."@en
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