RGE Somme river bay field course

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THE BAY OF THE RIVER SOMMEFIELD COURSE

RGE 2020-21

Day #1

Debriefing

Introduction

Day #2

Day #3

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.

RGE's Somme river bay field course

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D3

D2

D2

D1

D1

DEBRIEF

INTRO p.1/4

INTRO

Stops

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)

INTRODUCTIONto RGE's Somme river bay field course

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D2

D1

INTRO p.2/4

DEBRIEF

INTRO

Northern bay bank outcrops

Southern bay bankoutcrops

Somme river bay field course - Outcrops schedule 2020

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D2

D1

DEBRIEF

INTRO p.3/4

INTRO

See zoom area on next page

Somme river bay field course - General map

D3

D2

D1

Watch

Outcrops locations on Google Earth

Google Earth

to D1

INTRO p.4/4

DEBRIEF

INTRO

Somme river bay field course - Stops location map

(interview of Pr Alain Trentesaux)

Southern Somme river bank - cliFfS & Waves

DAY #1

DAY1 - p.1/2

General outcrop presentation

D3

D2

D1

Stop#3 - Brighton-les-pins

Stop#2 - Cayeux-sur-mer

Gravel beach Complex & composite gravel bars dynamics & construction

Groynes on beach at amer Sud Gravel bar dynamics

Landscape view from village edge Chalk cliff, beach and related dynamics

Stop#1 - Ault

DEBRIEF

INTRO

Types of plankton

DAY1 - p.2/2

RGE 2021 - Field course

Southern Somme river bank - cliFfS & Waves

D3

D2

D1

Videos from Stop#3 (RGE 2020 students)

Videos from Stop#2 (RGE 2020 students)

Videos from Stop#1 (RGE 2020 students)

DAY #1

DEBRIEF

INTRO

D3

Spring vs Neap

D2

D1

Tides theory 2

Tides theory 1

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

(interview of Pr Alain Trentesaux)

DAY #2

Southern Somme river bank - RIVER & TIDES

General outcrop presentation

DAY2 - p.1/2

Paleo chalk cliff Fossilized cliff - Supra-tidal environment

DEBRIEF

Stop#6b: Bois Houdant

INTRO

Stop#6a: Cap Hornu

Stop#5: St Valéry chapel

Landscape view Panoramic view of the Somme river estuary

Composite seashore Gravel bar, river channel, tidal flat in estuary

Stop#4: Pointe du Hourdel

DAY #2

DAY2 - p.2/2

RGE 2021 - Field course

Southern Somme river bank - RIVER & TIDES

Tidal channel

Schorre

Slikke

Tidal flat

Ebb

Flood

High tide (day 2)

Low tide (day 1)

Paleo-cliff and foothill sediments (bivalve clasts)

Cap Hornu: evolution of the southern bank geometry & filling

Stop#6b: Bois Houdant

Videos from Stop#6b

Videos from Stop#6a

Videos from Stop#5

D3

Videos from Stop#4

D2

Stop#6a: Cap Hornu

Stop#5: St Valéry chapel

D1

Stop#4: Pointe du Hourdel

DEBRIEF

INTRO

(interview of Pr Alain Trentesaux)

DAY #3

Northern Somme river bank - Quarry & dam

General outcrop presentation

DAY3 - p.1/2

D3

D2

D1

Stop#9b: Le Crotoy - flushing dam

Landscape viewSea water retention basin

Stop#9a: Le Crotoy - belvedere

Stop#8: La Maye

Landscape view Panoramic view of the Somme river estuary

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

Excavated outcropPartially lithified (“fossilized”) gravel bar

Stop#7: Le Crotoy - quarry

DEBRIEF

INTRO

DAY3 - p.2/2

RGE 2021 - Field course

DAY #3

Northern Somme river bank - Quarry & dam

Sectionin upper supra-tidal sediments

Muddybottom sediments

Interpretive section in quarry

View from belvedere @ high tide

Flushing dam @ low tide

La Maye : evolution of the northern bank geometry & filling

Videos from Stop#9b

Videos from Stop#9a

Videos from Stop#8

Videos from Stop#7

Stop#9b: Le Crotoy - flushing dam

D3

D2

D1

Stop#9a: Le Crotoy - belvedere

Stop#8: La Maye

Stop#7: Le Crotoy - quarry

DEBRIEF

INTRO

D3

D2

D1

Available until Dec.31 2020 only ->

GeoComics: Mr Flint(Hayane Fernandes)

Map legend

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.

Base map for reporting

Bonus...

Pictures on Google Drive

DEBRIEFING p.1/1

DEBRIEF

INTRO

Grinding halt...

Morning debriefingsession 2

Morning debriefingsession 1

Somme river bay field course - Morning debriefing sessions