- Usage in publication:
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- Paradise Fork Formation*
- Modifications:
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- Named
- Biostratigraphic dating
- AAPG geologic province:
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- Alaska West-Central region
Summary:
Type locality designated in low hills between Paradise Fork and upper Sulukna River drainages, secs.11,12,14 and 23 T19S R26E, Medfra D-2 quad, west-central AK. Forms generally southwest-trending synform. Is sequence of dark-gray, thin-bedded platy limestone and black shale, at least 1000 m thick. Disconformably(?) overlies Telsitna Formation (new); apparently unconformably (?) underlies Whirlwind Creek Formation (new). Diagnostic fossils from lower part of Paradise Fork are graptolites identified by Claire Carter (written commun., 1978) as of latest Llandoverian to early Wenlockian Age. Age of upper part roughly estimated from ostracodes identified by J.M. Berdan (written commun,, 1979) as probably not younger than Wenlockian. Age of unit is Early Silurian [according to 1983 DNAG Geologic Time Scale].
Source: GNU records (USGS DDS-6; Menlo GNULEX).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
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Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).