diff --git a/README.predictions-json.md b/README.predictions-json.md
index a72bb20..375151e 100644
--- a/README.predictions-json.md
+++ b/README.predictions-json.md
@@ -10,7 +10,6 @@ Each key in the JSON object is the name of a PDF file. The extracted data is lis
 - `layers`: a list of objects, where each object represents a layer of the borehole profile, using the following keys:
   - `material_description`: the text of the material description, both as a single value as well as line-by-line, and the location in the PDF where the text resp. the lines where extracted from.
   - `depth_interval`: the measured depth of the upper and lower limits of the layer, and the location in the PDF where they were extracted from.
-  - `id`: a unique identifier.
 - `bounding_boxes`: a list of objects, one for each (part of a) borehole profile in the PDF, that list some bounding boxes that can be used for visualizations. Each object has the following keys:
   - `sidebar_rect`: the area of the page the contains a "sidebar" (if any), which contains depths or other data displayed to the side of material descriptions.
   - `depth_column_entries`: list of locations of the entries in the depth column (if any).
@@ -87,8 +86,7 @@ All bounding boxes are measured with PDF points as the unit, and with the top-le
             "value": 6.0,
             "rect": [201.62551879882812, 374.30560302734375, 210.0361328125, 380.828857421875]
           }
-        },
-        "id": "2b841b12-1f8d-4845-a873-0916b2a09420"
+        }
       },
       # ... (more layers)
     ],
diff --git a/src/stratigraphy/layer/layer.py b/src/stratigraphy/layer/layer.py
index bcb445a..a653d31 100644
--- a/src/stratigraphy/layer/layer.py
+++ b/src/stratigraphy/layer/layer.py
@@ -1,7 +1,6 @@
 """Layer class definition."""
 
-import uuid
-from dataclasses import dataclass, field
+from dataclasses import dataclass
 
 import fitz
 from stratigraphy.data_extractor.data_extractor import ExtractedFeature, FeatureOnPage
@@ -17,7 +16,6 @@ class Layer(ExtractedFeature):
 
     material_description: FeatureOnPage[MaterialDescription]
     depth_interval: AAboveBInterval | None
-    id: uuid.UUID = field(default_factory=uuid.uuid4)
 
     def __str__(self) -> str:
         """Converts the object to a string.
@@ -39,7 +37,6 @@ def to_json(self) -> dict:
         return {
             "material_description": self.material_description.to_json() if self.material_description else None,
             "depth_interval": self.depth_interval.to_json() if self.depth_interval else None,
-            "id": str(self.id),
         }
 
     @classmethod