Forensic geology is one of the modern branches of geology. It combines Earth science (geology) with forensic science and criminal investigation sciences to analyze physical evidence associated with crimes. This field involves the study of geological materials such as soil, rocks, minerals, and dust particles to determine their relationship to crime scenes or suspects, making it an important tool for uncovering facts and establishing innocence or guilt. Forensic geology represents an important contribution to forensic evidence science, as it enables the distinctive characteristics of geological materials to be utilized to uncover facts, identify locations, and link individuals to events. With the development of modern technologies, this field has become more accurate and effective, making it an indispensable component of many contemporary criminal investigations. First: The Concept of Forensic Geology Forensic geology is defined as the application of geological principles to the analysis of evidence associated with crime. It relies on the characteristics of soil, its mineral composition, and the geomorphological structure of a site, which can help link individuals or objects to specific locations. This field is distinguished by the fact that soil is a unique material, as its composition, color, and elemental concentrations vary from one location to another. This makes soil a powerful form of evidence in criminal investigations. Second: Types of Geological Evidence The types of evidence that can be analyzed within the field of forensic geology include the following: A. Soil Soil is one of the most important and commonly used forms of geological evidence. It can be found on clothing, tools, vehicles, or footwear. Soil can be analyzed based on its color, texture, grain size, chemical composition, and mineral composition. B. Sand The distribution patterns of mineral grains can be used to identify the beaches or deserts from which the sand originated. C. Rocks and Minerals The analysis of rock fragments or fine mineral grains can help determine their geographical origin. D. Dust Dust contains a mixture of organic and mineral materials that may indicate specific environments, such as industrial areas. Third: Analytical Techniques in Forensic Geology 1. Petrographic Analysis (Petrography) A polarized light microscope is used to examine thin sections of soil and rocks, helping to identify and distinguish different minerals. 2. Chemical and Mineralogical Analysis This analysis is used to determine the specific elements and compounds present in a sample, such as: X-ray Fluorescence (XRF) X-ray Diffraction (XRD) 3. Grain-Size Analysis This technique measures the size and shape of particles, helping to determine the geographical environment in which they were formed. 4. Scanning Electron Microscopy (SEM) Scanning electron microscopy provides a detailed view of surfaces and very small particles. It may reveal mechanical marks resulting from transportation or friction. Fourth: Applications of Forensic Geology in Criminal Investigations A. Linking a Suspect to a Crime Scene Soil traces found on a suspect’s footwear can be compared with soil samples collected from the crime scene. B. Locating a Crime Scene When the location of a crime is unknown, soil or sediment can provide evidence that helps determine the geographical location. It can also assist in identifying hiding places used to store weapons and drugs. C. Locating Buried Bodies Forensic geology can help accurately locate old and previously unknown graves, whether individual graves or mass graves. Forensic geologists use various techniques to identify areas of recent excavation, including: Ground-Penetrating Radar (GPR) Analysis of disturbances in sedimentary layers D. Detecting Environmental Violations Soil analysis can help uncover environmental violations, such as the illegal disposal of waste or contamination. E. Identifying Buried Evidence Forensic geology can assist in identifying buried evidence, whether it was accidentally dropped or intentionally buried in loose soil such as sand, clay, or similar materials. Fifth: Real-World Examples of the Use of Geology in Investigations London Police used soil adhering to a vehicle’s tire to help locate the burial site of a body in a well-known murder case. In the United States, sand analysis helped establish a connection between a suspect and a crime scene located on a remote beach. Al-Mustaqbal University – the first university in Iraq.
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