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A unique World War II battlefield artifact fused to a beach deposit

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Aug 22, 2025

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Figure 1.

(A) Map of the Baltic Sea with marked Kołobrzeg location. (B) A site on the Kołobrzeg beach where the specimen was found.
(A) Map of the Baltic Sea with marked Kołobrzeg location. (B) A site on the Kołobrzeg beach where the specimen was found.

Figure 2.

Major components of a bullet.
Major components of a bullet.

Figure 3.

(A) Macrophotograph of the worn machine gun bullet embedded in a conglomeratic Fe/Mn-rich quartz-limestone sandstone bound to a semi-rounded micritic limestone pebble (+HCl). Specimen microphotographs: (B) upper part of the worn bullet encircled by a sintered Fe/Mn-rich halo, (C) a fragment of the bullet-sandstone boundary with a distinct Fe/Mn-rich streak, (D) a ferruginous sandstone (center) in direct contact with a limestone pebble (left) and a bullet fragment (right).
(A) Macrophotograph of the worn machine gun bullet embedded in a conglomeratic Fe/Mn-rich quartz-limestone sandstone bound to a semi-rounded micritic limestone pebble (+HCl). Specimen microphotographs: (B) upper part of the worn bullet encircled by a sintered Fe/Mn-rich halo, (C) a fragment of the bullet-sandstone boundary with a distinct Fe/Mn-rich streak, (D) a ferruginous sandstone (center) in direct contact with a limestone pebble (left) and a bullet fragment (right).

Figure 4.

(A) Macrophotograph of a ferruginous limestone pebble in direct contact with a conglomeratic sandstone. (B) Microphotograph showing a more detailed microtextural relationship between the conglomeratic sandstone and the limestone pebble; note that the yellow ferruginous streak separates these two petrographic components, which may also point to heating.
(A) Macrophotograph of a ferruginous limestone pebble in direct contact with a conglomeratic sandstone. (B) Microphotograph showing a more detailed microtextural relationship between the conglomeratic sandstone and the limestone pebble; note that the yellow ferruginous streak separates these two petrographic components, which may also point to heating.

Concentrations of elements in three different parts of the sample (in mg/kg, otherwise indicated as %)_

Part Ba Ca Cu Fe K Mn S Si Ti Zn
L 320 ± 60 36.3 ± 0.2% 68 ± 14 1.24 ± 0.02% 3642 ± 177 338 ± 56 1217 ± 89 2.41 ± 0.09% 413 ± 81 104 ± 10
S 315 ± 63 14.6 ± 0.1% 90 ± 17 8.37 ± 0.07% 4203 ± 230 1959 ± 112 8041 ± 136 14.5 ± 0.19% 2228 ± 106 112 ± 12
B 380 ± 199 6284 ± 519 67.0 ± 1.6% 2.56 ± 0.03% 405 ± 195 314 ± 97 9970 ± 418 1.70 ± 0.06% 279 ± 65 7.78 ± 02%

CRM NIST 27280 hard rock mine waste

Certified 993 1950 215.5 2.78% 3.38% 462 1.26% 31% 6990 2570
Determined 973 ± 38 1950 ± 99 177 ± 16 2.22 ± 0.2% 3.31 ± 0.1% 434 ± 58 1.10 ± 0.1% 27 ± 0.1% 6710 ± 102 2082 ± 37
Recovery 98% 100% 82% 80% 98% 94% 85% 86% 96% 81%
Language:
English
Publication timeframe:
1 times per year
Journal Subjects:
Geosciences, Geophysics, Geosciences, other