RGE Somme river bay field course

RGE 2020-21

THE BAY OF THE RIVER SOMMEFIELD COURSE

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RGE's Somme river bay field course

A sedimentological analysis on various outcrops in the Northwestern part of France (Picardie, Paris basin) to illustrate the variety of modern siliciclastic depositional processes and facies in shallow marine, coastal and littoral environments, and to observe the interactions between multiple sources of sediment transport & reworking: river, tides and waves.Reservoir potential shall be evaluated on each outcrop.

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Day #2

Introduction

Debriefing

Day #1

INTRODUCTIONto RGE's Somme river bay field course

1. Ault
2. Cayeux-sur-mer
3. Brighton-les-pins
4. Le Hourdel
5. Chapelle des marins
6. Cap Hornu (a&b)
7. Oscar Savreux
8. La Maye
9. Le Crotoy (a&b)

Stops

INTRO

INTRO p.1/4

DEBRIEF

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Somme river bay field course - Outcrops schedule 2020

Southern bay bankoutcrops

Northern bay bankoutcrops

INTRO

DEBRIEF

INTRO p.2/4

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Somme river bay field course - General map

See zoom area on next page

INTRO

INTRO p.3/4

DEBRIEF

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Somme river bay field course - Stops location map

INTRO

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DEBRIEF

INTRO p.4/4

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Google Earth

Outcrops locations on Google Earth

Watch

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To load stops locations on base map: 1. Open Google Earth 2. Download the kmz file 3. Upload it into Google Earth's "Projects"

INTRO

DEBRIEF

Stop#1 - Ault

Landscape view from village edgeChalk cliff, beach and related dynamics

Groynes on beach at amer SudGravel bar dynamics

Gravel beachComplex & composite gravel bars dynamics & construction

Stop#2 - Cayeux-sur-mer

Stop#3 - Brighton-les-pins

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General outcrop presentation

DAY1 - p.1/2

DAY #1

Southern Somme river bank - cliFfS & Waves

(interview of Pr Alain Trentesaux)

INTRO

DEBRIEF

DAY #1

Videos from Stop#1(RGE 2020 students)

Videos from Stop#2(RGE 2020 students)

Videos from Stop#3(RGE 2020 students)

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D2

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Southern Somme river bank - cliFfS & Waves

RGE 2021 - Field course

DAY1 - p.2/2

Types of plankton

Stop#4: Pointe du Hourdel

Composite seashoreGravel bar, river channel, tidal flat in estuary

Landscape view Panoramic view of the Somme river estuary

Stop#5: St Valéry chapel

Stop#6a: Cap Hornu

INTRO

Stop#6b: Bois Houdant

DEBRIEF

Paleo chalk cliffFossilized cliff - Supra-tidal environment

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General outcrop presentation

Southern Somme river bank - RIVER & TIDES

DAY #2

(interview of Pr Alain Trentesaux)

Tidal flat (slikke & schorre)Salt marshes and tidal channel dynamics

Tides theory 1

Tides theory 2

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D2

Spring vs Neap

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INTRO

DEBRIEF

Stop#4: Pointe du Hourdel

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Stop#5: St Valéry chapel

Stop#6a: Cap Hornu

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Videos from Stop#4

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Videos from Stop#5

Videos from Stop#6a

Videos from Stop#6b

Stop#6b: Bois Houdant

Cap Hornu: evolution of the southern bank geometry & filling

Paleo-cliff and foothill sediments (bivalve clasts)

Lowtide(day 1)

Hightide(day 2)

Flood

Ebb

Tidal flat

Slikke

Schorre

Tidal channel

Southern Somme river bank - RIVER & TIDES

RGE 2021 - Field course

DAY2 - p.2/2

DAY #2

INTRO

DEBRIEF

Stop#7: Le Crotoy - quarry

Excavated outcropPartially lithified (“fossilized”) gravel bar

Upper supra-tidal vegetated zone Evolution of the bay's gradual filling

Landscape viewPanoramic view of the Somme river estuary

Stop#8: La Maye

Stop#9a: Le Crotoy - belvedere

Landscape viewSea water retention basin

Stop#9b: Le Crotoy - flushing dam

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DAY3 - p.1/2

General outcrop presentation

Northern Somme river bank - Quarry & dam

DAY #3

(interview of Pr Alain Trentesaux)

INTRO

DEBRIEF

Stop#7: Le Crotoy - quarry

Stop#8: La Maye

Stop#9a: Le Crotoy - belvedere

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Stop#9b: Le Crotoy - flushing dam

Videos from Stop#7

Videos from Stop#8

Videos from Stop#9a

Videos from Stop#9b

La Maye : evolution of the northern bank geometry & filling

Flushing dam @ low tide

View from belvedere @ high tide

Interpretive section in quarry

Muddybottomsediments

Sectionin upper supra-tidal sediments

Northern Somme river bank - Quarry & dam

DAY #3

RGE 2021 - Field course

DAY3 - p.2/2

Somme river bay field course - Morning debriefing sessions

Morning debriefingsession 1

Morning debriefingsession 2

Grinding halt...

INTRO

DEBRIEF

DEBRIEFING p.1/1

Pictures on Google Drive

Bonus...

Base mapfor reporting

Field course deliverables - A3 geological map of the Somme river bay sediments (based on actual observations in the field), with a clear & clean legend.- One page of text (max.) explaining the map (i.e. geological evolution of the bay, summary of main characteristics of observed depositional environments and agents, expected reservoir quality of each facies,…). - “Flint’s odyssey“ (1 page): summarize the story of flint-stone gravel, from cradle to grave (from chert formation to final flint accumulation and facies). You can make a comic-type (or manga-type*) drawn story if you feel like.

Maplegend

GeoComics: Mr Flint(Hayane Fernandes)

*

Available until Dec.31 2020 only ->

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