SPODDS SPECIAL FIELDTRIP NEW ZEALAND, 2010 Day 3 & 4 DEEPWATER DEPOSITS OF THE LOWER MOUNT MESSENGER FORMATION, UPPER MIOCENE, TARANAKI BASIN

Content Map of the stops Outcrops Architecture Stop description Acknowledgements

Map of the stops Lower Mt Messenger Formation

Outcrops Mohakatino River Jam Roll Rapanui Stream Tongaporutu River Potroz Section (won’t be visited) Waikiekie Stream Inland section

Architecture Mohakatino RvJam Roll Potroz Packages in style of deposition Thin-bedded complex Thick-bedded sandstones MTD Siltstone package 4m Scale

Stops description Lower Mt Messenger Formation:

1. Mohakatino River Main lithofacies: Thick-bedded sandstone (S3- Ta), thickness 50 cm to 3 m Sandstone with plane lamination (Tb) and ripples (Tc) Thick bioturbated siltstone package with thin ash layers and thin sandstone beds Thin mud layers (Te) MTD Bioturbated siltstone Thin bed of bioturbated sandstone siltstone Thick-bedded sandstone Erosional contact between sandstone & siltstone

1. Mohakatino River High density turbiduty currents Energetic flows capable to erode High rate of sedimentation Small periods of time between flows

2. Jam Roll deposits Main lithofacies: Mass Transport Deposits Thick-bedded sandstones Disturbed siltstone & mudstone Courtesy of Donald Lowe

2. Jam Roll Siltstone MTD Thick-bedded sandstones Key features: Sliding blocks, soft sediment deformation Shearing surfaces Active settings Slope instabilities & failures

3. Rapanui Stream Main lithofacies: Siltstone dominated MTD Sandstone dominated MTD Thick-bedded sandstones Siltstone Sandstone with thin mudstone beds Two different MTD brought together by fault Siltstone dominated MTD Courtesy of Donald Lowe

3. Rapanui Stream Sandstone dominated MTD

4. Tongaporutu River Main lithofacies: thick-bedded amalgamated sandstone thin-bedded siltstone and sandstone highly bioturbated thick-bedded siltstone mud-clast conglomerates

4. Tongaporutu River Finninng Upward Cross-stratification in thick- bedded sandstones Key features: Overall upward fining cycle compensational style of deposition Complete cycle of Deposition

5. Inland section

6. Waikiekie stream Channels Main lithofacies: thick-bedded sandstones thin-bedded siltstone and sandstone highly bioturbated siltstone packages mud-clast conglomerates siltstone dominated MTD Key features: Nested channels Highly energetic flows Transition between lower and Upper Mt. Messenger Fm.

6. Waikiekie stream Rotated blocks Channel

18 SPODDS Students: Jon Rotzien, Lisa Stright. Zane Jobe, Katie Maier, Julie Fosdick, Anne Bernhardt, Glenn Sharman, Blair Burgreen, Acknowledgements Geological and Nuclear Sciences (GNS) in New Zealand

Thank you for your attention! New Zealand, 2009