The Renaturing Project
The Renaturing Project
The land beneath Wild Roots tells a story spanning 200 million years — from Jurassic limestone to Quaternary sand dunes. Understanding this foundation is key to successful restoration.
Wild Roots sits within the Algarve Basin, a Mesozoic sedimentary basin at the southwestern tip of the Iberian Peninsula.
The Algarve Basin formed during the breakup of Pangaea in the Triassic period (~230 Ma) as the Iberian Plate separated from North Africa. The resulting rift basin accumulated thick sequences of marine sediments — limestones, dolomites, marls, and sandstones — as shallow tropical seas repeatedly advanced and retreated over the region.
Vila do Bispo occupies the western margin of this basin, where the dominant Jurassic and Cretaceous carbonates give way to younger Miocene formations and Quaternary cover deposits. The area's position at the collision zone of the Atlantic and Mediterranean tectonic regimes makes it geologically complex and scientifically fascinating.
The principal rock formations underlying and surrounding the Wild Roots site, from oldest to youngest.
Massive to bedded limestones and dolomites. These karstified carbonates form the regional aquifer system and underlie much of the Costa Vicentina. Rich in marine fossils — bivalves, ammonites, and echinoids.
Alternating sequences of marls, marly limestones, and clay-rich layers. These softer formations form gentle slopes and control drainage patterns across the landscape.
Fossiliferous sandstones and calcarenites deposited in shallow warm seas. These yellowish formations are visible along the Algarve coast as the characteristic golden cliff faces. They provide excellent drainage and the calcareous substrate favored by many endemic plant species.
Iron-rich fluvial and aeolian sands that blanket much of the Algarve plateau. These characteristically red-orange deposits (locally called "barrocal sands") are the dominant surface geology on the Wild Roots site. Acidic, nutrient-poor, but well-drained — defining the heathland and maquis plant communities.
Coastal dune systems, colluvial deposits, and thin alluvial fills in valleys. These youngest deposits include the consolidated dune sands (aeolianites) visible along the coast and the unconsolidated sands that support the characteristic dune flora including Juniperus turbinata.
The Wild Roots land encompasses several distinct soil types, each supporting different plant communities and requiring different restoration approaches.
The predominant soil type. Moderately deep (40–80 cm), well-drained, slightly acidic (pH 5.5–6.5). Developed on the Plio-Pleistocene red sands. Low organic matter (1–2%) and nutrient content. Supports maquis and heathland vegetation. Primary target for organic matter restoration.
Thin soils (<20 cm) directly on limestone bedrock. Found on exposed ridges and steeper slopes. Alkaline (pH 7.5–8.2) with high carbite content. Supports calcicolous species like Thymus camphoratus and Teucrium vicentinum. Limited restoration potential but high conservation value.
Deep sandy soils in lower areas. Very low water retention and nutrient holding capacity. pH 5.0–6.0. Home to specialist species like Drosophyllum lusitanicum and Stauracanthus spectabilis that thrive in nutrient-poor conditions. Key for heathland restoration.
Alluvial soils in valley bottoms and seasonal watercourses. Deeper (1m+), higher organic content, periodic waterlogging. Support the Mediterranean temporary ponds (Habitat 3170*) hosting Tuberaria major and Triops vicentinus. Critical for pond restoration.
Understanding water flow is essential for permaculture design, pond restoration, and irrigation planning.
The Wild Roots site lies above the Querença-Silves Aquifer System (M11), one of the most important groundwater bodies in the Algarve. The upper Jurassic limestones form a karst aquifer with high transmissivity but variable depth. A traditional well (poço) on the property accesses this aquifer at approximately 15–20 m depth.
Surface hydrology is dominated by seasonal patterns: winter rains saturate the thin soils and fill temporary ponds, while summer drought draws the water table down, creating the extreme wet-dry cycle that defines Mediterranean temporary pond ecosystems (EU Habitat 3170*).
Karst aquifer in Jurassic limestone. Water table at 15–20 m. Traditional well on site. Water quality: good, calcium-bicarbonate type. Recharge zone for Querença-Silves system.
Seasonal streams (ribeiras) active Oct–May. Mediterranean temporary ponds fill in winter. Zero surface flow June–September. Keyline design planned for water harvesting and distribution.
Geology and soils dictate what we can grow, how we manage water, and where we build.
The Cambisol-dominated soils have been degraded by decades of eucalyptus monoculture and subsequent clearing. Organic matter levels have dropped below 1.5% — well below the 3–4% target for healthy Mediterranean soils. Our restoration focuses on rebuilding soil biology through cover cropping, mulching with chipped biomass, biochar application, and encouraging mycorrhizal networks through native plant establishment.
The variable geology — from shallow limestone to deep sands — requires careful foundation design. Geotechnical surveys indicated that building pads should target the consolidated Plio-Pleistocene sands (bearing capacity ~150 kPa) while avoiding the unconsolidated Quaternary deposits in valley floors. The limestone bedrock provides excellent foundations where accessible but requires specialized excavation.
Permaculture keyline design follows the contours revealed by geological mapping. Swales are positioned along soil-type boundaries to intercept runoff from less permeable Cambisols and direct it toward the more permeable Arenosols and natural ponding areas. This mimics the natural hydrology while increasing groundwater recharge — critical for maintaining the temporary ponds that support our rarest species.