RGE Somme river bay field course

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RGE 2020-21

THE BAY OF THE RIVER SOMMEFIELD COURSE

Start

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.

Introduction

Day #2

Debriefing

Day #3

Day #1

INTRO p.1/4

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)

INTRO

D1

D1

D2

D2

D3

DEBRIEF

Stops

D3

INTRO p.2/4

Somme river bay field course - Outcrops schedule 2020

INTRO

D1

D2

Southern bay bankoutcrops

D3

DEBRIEF

Northern bay bank outcrops

INTRO p.3/4

Somme river bay field course - General map

INTRO

D1

D2

D3

DEBRIEF

See zoom area on next page

INTRO p.4/4

Somme river bay field course - Stops location map

Google Earth

INTRO

Outcrops locations on Google Earth

D1

D2

Watch

D3

to D1

DEBRIEF

DAY1 - p.1/2

DAY #1

Southern Somme river bank - cliFfS & Waves

General outcrop presentation

(interview of Pr Alain Trentesaux)

INTRO

Stop#1 - Ault

Stop#2 - Cayeux-sur-mer

Stop#3 - Brighton-les-pins

D1

D2

D3

DEBRIEF

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

Groynes on beach at amer Sud Gravel bar dynamics

Gravel beach Complex & composite gravel bars dynamics & construction

DAY1 - p.2/2

DAY #1

Southern Somme river bank - cliFfS & Waves

RGE 2021 - Field course

INTRO

D1

D2

D3

DEBRIEF

Videos from Stop#2 (RGE 2020 students)

Videos from Stop#1 (RGE 2020 students)

Videos from Stop#3 (RGE 2020 students)

Types of plankton

DAY2 - p.1/2

DAY #2

Southern Somme river bank - RIVER & TIDES

General outcrop presentation

(interview of Pr Alain Trentesaux)

Stop#4: Pointe du Hourdel

Stop#5: St Valéry chapel

Stop#6a: Cap Hornu

INTRO

D1

D2

D3

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

Landscape view Panoramic view of the Somme river estuary

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

DEBRIEF

Stop#6b: Bois Houdant

Tides theory 1

Tides theory 2

Spring vs Neap

Paleo chalk cliff Fossilized cliff - Supra-tidal environment

DAY2 - p.2/2

DAY #2

Southern Somme river bank - RIVER & TIDES

RGE 2021 - Field course

INTRO

Stop#6a: Cap Hornu

Stop#4: Pointe du Hourdel

Stop#5: St Valéry chapel

Stop#6b: Bois Houdant

Videos from Stop#4

Videos from Stop#5

Videos from Stop#6a

Videos from Stop#6b

D1

Low tide (day 1)

High tide (day 2)

Ebb

Flood

Schorre

D2

Tidal channel

D3

Slikke

Tidal flat

DEBRIEF

Cap Hornu: evolution of the southern bank geometry & filling

Paleo-cliff and foothill sediments (bivalve clasts)

DAY3 - p.1/2

DAY #3

Northern Somme river bank - Quarry & dam

General outcrop presentation

(interview of Pr Alain Trentesaux)

Stop#8: La Maye

Stop#9a: Le Crotoy - belvedere

Stop#7: Le Crotoy - quarry

INTRO

D1

D2

D3

Landscape view Panoramic view of the Somme river estuary

Excavated outcropPartially lithified (“fossilized”) gravel bar

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

Stop#9b: Le Crotoy - flushing dam

DEBRIEF

Landscape viewSea water retention basin

DAY3 - p.2/2

DAY #3

Northern Somme river bank - Quarry & dam

RGE 2021 - Field course

INTRO

Stop#8: La Maye

Stop#7: Le Crotoy - quarry

Stop#9a: Le Crotoy - belvedere

Stop#9b: Le Crotoy - flushing dam

Videos from Stop#7

Videos from Stop#8

Videos from Stop#9a

Videos from Stop#9b

D1

View from belvedere @ high tide

Interpretive section in quarry

D2

D3

DEBRIEF

Sectionin upper supra-tidal sediments

Muddybottom sediments

La Maye : evolution of the northern bank geometry & filling

Flushing dam @ low tide

DEBRIEFING p.1/1

Somme river bay field course - Morning debriefing sessions

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.

Morning debriefingsession 1

INTRO

Base map for reporting

Map legend

Morning debriefingsession 2

D1

D2

Grinding halt...

D3

DEBRIEF

Pictures on Google Drive

GeoComics: Mr Flint(Hayane Fernandes)

Bonus...

Available until Dec.31 2020 only ->