Lieu-dit · Vergisson
La Truche
La Truche is a lieu-dit in Vergisson, Mâconnais, Burgundy, whose largest tier is village.
0.45 ha
delimited
301 m
elevation
11.2 h
sun at harvest
Open on the mapWith the boundary, the plots, the sun through the year and the bedrock.
In figures
| Level | Villageinao-aoc-viticoles-bulk (c. 4 September 2026) |
|---|---|
| Village | Vergisson |
| Region | Mâconnais, Burgundy |
| Delimited | 0.45 hainao-aoc-viticoles-bulk (c. 4 September 2026) · cadastre-etalab (4 September 2026) |
| Planted | 0.37 hacadastre-etalab (4 September 2026) · ign-bdtopo-vigne (5 September 2026) · ign-rpg-2024 (5 September 2026) |
| Parcels | 8 |
| Grape variety | chardonnayinao-cahiers-des-charges (7 September 2026) · dgddi-superficies-produits (7 September 2026) · franceagrimer-observatoire-viticulture (7 September 2026) |
| Organic | 68%agence-bio-cartobio (c. 5 September 2026) · agence-bio-operateurs (5 September 2026) |
Place in the village
Among the 35 named plots ranked village in Vergisson, from high to low:
Position
301 m
elevation
28.0%
very steep
SE
southeast
mid-slope
convex ridge
| Elevation | 301 m 290 to 316 mign-rge-alti (5 September 2026) |
|---|---|
| Daytime temperature | +0.38 °C by day, relative to the village centre at 354 m, ± 0.04 °Cmeteo-france-quotidiennes (6 September 2026) · meteo-france-postes (6 September 2026) · meteo-france-lsh (6 September 2026) · ign-rge-alti (5 September 2026) |
| Slope | 28.0% 15.7°ign-rge-alti (5 September 2026) |
| Aspect | southeast 141°ign-rge-alti (5 September 2026) |
| On the slope | 21% mid slope, on a convex ridge, 96 m drains onto itign-rge-alti (5 September 2026) |
Bedrock
- 12%Modern alluvium of the rivers 0.012–0 million years
- 70%Sinemurian limestone with gryphaea 199.5–193 million years
- 18%Triassic to Hettangian, undifferentiated about 235–199 million years
Not a borehole: ordered by age, thickness by share of surface.
In the glass. Where this layer comes to the surface in the Mâconnais, the ground is usually described as more clayey and later than on hard limestone. That follows from the clay content and the water supply, not from the rock as such.
Dark grey, often somewhat clayey shelly limestone from the Sinemurian, roughly 199.5 to 193 million years ago, deposited in a shallow, muddy sea. The layer takes its name from the gryphaea, a thick curved oyster whose shells occur in it by the thousand; ammonites and belemnites are also common. In the ground this yields flat, dark limestone shards within a fairly heavy, clayey earth.
For the vine. There is more clay in it than in the pure Jurassic limestones, so more water storage, but also a ground that warms up slowly in spring and stays heavy after rain. The limestone beds do provide shards and cracks along which roots can nevertheless go down. Slope and drainage weigh more heavily here than on most other subsoils.
Characteristic of parts of the Mâconnais, where the grey Lias marls and the limestone with gryphaea together form the lower slopes.
BRGM geological map at 1:50,000. It tells vineyards apart, not plots within a vineyard. The link between rock and taste is indirect: soil depth, water and warmth do the work, and slope, vine age and the cellar do the rest. Units on that map: l2, tA-l1, Fz.
brgm-bdcharm50 (4 September 2026)Sun and horizon
07:27
above the flat horizon
18:40
behind the hill
11.2 h
sun at harvest
Grey: sun up, but behind the hill or the vineyard's own slope.
Around harvest the sun rises here at 07:27 above the flat horizon and disappears at 18:40 behind the hill: 11.2 hours of direct sun on a clear day. The ridge reaches 14.4° above the horizon to the northwest. The relief costs 0.6% of the irradiation from April to October, direct and diffuse together.
| Irradiation | +3.1% versus flat land 1,099 kWh/m² from April to October, 38% of it diffuseunder the average cloudiness of 2005 to 2023 (PVGIS-SARAH3, EU JRC); direct, diffuse and reflected light togetherign-rge-alti (5 September 2026) · ign-lidarhd-mnh (6 September 2026) · ign-bdforet-v2 (5 September 2026) · jrc-pvgis-sarah3 (10 September 2026) |
|---|---|
| Open sky | 97.0% of the sky the slope itself sees; the surrounding relief blocks the restign-rge-alti (5 September 2026) · ign-lidarhd-mnh (6 September 2026) · ign-bdforet-v2 (5 September 2026) |
Three reference days and the caveat
| rise | set | sun | day | |
|---|---|---|---|---|
| 21 June | 06:24 | 20:05 | 13.7 h | 15.8 h |
| 20 September | 07:27 | 18:40 | 11.2 h | 12.3 h |
| 21 December | 09:50 | 16:02 | 6.2 h | 8.6 h |
Computed from the IGN elevation model at 5 m: horizon in 36 directions up to six kilometres, sun position per minute, angle of incidence on the mean slope. Clear sky, with the tree canopy from the IGN forest inventory as a raised horizon (15 m closed forest, 5 m heath, trees within 60 m ignored), 35% of the far field is forest (BD Forêt), no buildings.
The irradiation loss does include clouds: the average of 2005 to 2023 (PVGIS-SARAH3, EU JRC), not any particular year.
Air and cold
30 m
above the lowest point
drains far away
cold air
little inflow
0.3 ha flows past
| Cold air | 30 m high on the slope, cold air drains far awayign-rge-alti (5 September 2026) |
|---|---|
| Cold air passing through | 0.3 ha little inflow, mean over the polygon 0.07 haign-rge-alti (5 September 2026) |
Planting
SE-NW
down the slope
1.01 m
between the rows
100%
vineyard in 1950
| Rows | SE-NW (146°) down the slope (5°), every 1.01 m, slightly fannedmeasured over 0.3 of 0.4 ha plantedign-bdortho (6 September 2026) |
|---|---|
| Vineyard in 1950 | 100% abandoned since: 0.04 haassessed over 0.3 ha on the 1950-1965 aerial photographign-photos-historiques-1950-1965 (6 September 2026) |
Climate over time
station MACON, 219 m, 6.5 km away
growing season, April to October: 1951-1980: 15.4 °C, 1991-2020: 17.1 °C
Huglin index: 1951-1980: 1,718, 1991-2020: 2,022
last spring frost: 1951-1980: day 96, 1991-2020: day 85
series homogenised through 2022
Who owns land here
0.13 ha of 0.45 ha delimited is registered to a legal entity
- COMMUNE DE VERGISSON29%
- private individuals or unknown71%
- 0.13 ha COMMUNE DE VERGISSON COM · public
Private individuals or unknown: 0.32 ha.
Share of the delimited hectares. Only legal entities are public in France; everything else stays unnamed. From the public register of legal entities (DGFiP), as of 1 January 2025. The owner is not always the one who works the vineyard: tenancy is common.
Nearby lieux-dits
- La Folle Village · 100 m
- Prés des Gours Village · 100 m
- En France Village · 200 m
- Vergisson Village · 200 m
- Les Courtelongs Village · 350 m
- Le Nambret Premier Cru · 350 m
- Le Moulin Village · 350 m
- Chanserons Village · 400 m
In the same village, measured between label points. That does not say which ones border each other; the map shows that.
Where each figure comes from
- Classification
- The INAO delimitation per denomination, cut against the cadastral parcel. Only the INAO's own plans are legally binding; this map is informational.
- Area
- Computed on the sphere from longitude and latitude (turf.area), not in Lambert-93. For an appellation this is the union of the INAO polygons across commune boundaries, measured on the unclosed geometry; the fifteen metres used to close the outline for the map are not counted. For a climat it is the union of the cadastral lieu-dit polygons with that name.
- Planted
- Parcel area times vineyard cover, where cover comes from the IGN vegetation layer supplemented by the agricultural declaration. Checked against the customs harvest declarations: median deviation 5.1 per cent over a hundred appellations.
- Elevation
- Mean of the elevation-model cells whose centre falls inside the polygon, on a 5 m grid.
- Slope
- Per-cell slope from the elevation model using Horn's method, then averaged over the cells in the polygon.
- Aspect
- Vector mean of the per-cell aspect. A plain average would turn north-east and north-west into south.
- Sun at harvest
- Hours of direct sun on 20 September under a clear sky, with the horizon in 36 directions out to six kilometres and the height of woods and buildings on top of it. Canopy height is measured where LiDAR HD covers the area and estimated from BD Forêt where it does not; the panel states which of the two was used.
- Grape variety by appellation
- Per appellation and colour the permitted varieties from the approved cahier des charges; per appellation and tier the declared hectares of white and red from the customs harvest declaration (product codes). One colour permitted: the main variety of that colour. Two colours: from 85 percent of the hectares that colour applies, in between it is called mixed. Champagne: the dominant variety from the planted hectares per variety per commune from FranceAgriMer. Per polygon the dominant variety of its parts by area. Derived, not measured: the variety per plot exists only in the customs vineyard register, which is not public. In a two-colour appellation a single plot may carry the other variety. Customs withhold small appellations (statistical secrecy), in which case the split is missing.
- Bedrock
- The geological unit covering the largest share of the polygon, from the 1:50,000 geological map. At 1:50,000 the map separates one climat from another, but not what varies inside a climat.
- Organic
- Share of the area certified organic or in conversion, from the CartoBio plot register.