|
The Jackfork Formation exposures at McCain Mall, North Little Rock, represent a complex series of depositional environments. From base to top, these units have been interpreted as channel, channel slumps, debris flow, and late stage channel-fill, which are overlain by intercalated splay and distal levees,
which are capped by intercalated splays and distal levees. The 70' section seen here has been interpreted as 2 channel-fill sequences separated by a sheet sandstone. The sheet sand thickens upwards and has been interpreted as an overbank splay or an abandoned channel-fill sequence.
|
 Click for Larger View. Sandstone channel fill.  Click for Larger View. Closer view, channel fill termination. | ||
 Click for Larger View. Even closer view of channel termination and overlying thin beds.  Click for Larger View. Group observes turbidite sandstones on cold Spring morning. | ||
 Click for Larger View. Mudstone clast - pen for scale.
 Click for Larger View. Martin indicates contact between thin and thicker bedded sandstones in separate sedimentary packages. | ||
 Click for Larger View. Abandoned channel-fill. Possible sheet splay with undulous (wavy) contacts.  Click for Larger View. Undulous contacts between sandstone beds. |
|
Return to Virtual Fieldtrip #4 Index Page
Return to LGS Home Page