Question: The London Hammer is considered what type of artifact?

full_context: Document 1: Prehistoric art: In the history of art, prehistoric art is all art produced in preliterate, prehistorical cultures beginning somewhere in very late geological history, and generally continuing until that culture either develops writing or other methods of record-keeping, or makes significant contact with another culture that has, and that makes some record of major historical events. At this point ancient art begins, for the older literate cultures. The end-date for what is covered by the term thus varies greatly between different parts of the world.
Document 2: Learning artifact (education): In educational psychology , a learning artifact (or educational artifact) is an object created by students during the course of instruction. To be considered an artifact, an object needs to be lasting, durable, public, and materially present. Under the constructionist theory of educational psychology, the concept of making knowledge visible is a central component. The creation of material artifacts is a technique used to allow students to display their knowledge in a public forum (usually the classroom). Artifacts can be in the form of paintings, drawings, sculptures, models, or anything else that is not erased after completion.
Document 3: Ica stones: The Ica stones are a collection of andesite stones found in Ica Province, Peru that bear a variety of diagrams. Some of them supposedly have depictions of dinosaurs, and what is alleged to be advanced technology. These are recognised as modern curiosities or hoaxes.
Document 4: Out-of-place artifact: An out-of-place artifact (OOPArt) is an artifact of historical, archaeological, or paleontological interest found in an unusual context, that challenges conventional historical chronology by being "too advanced" for the level of civilization that existed at the time, or showing "human presence" before humans were known to exist.
Document 5: Hafting: Hafting is a process by which an artifact, often bone, metal, or stone, is attached to a "haft" (handle or strap). This makes the artifact more useful by allowing it to be shot (arrow), thrown (spear), or used with more effective leverage (axe or hammer). When constructed properly, hafting can tremendously improve a weapon's damage and range. It is estimated that hafted weapons were most common during the Upper Paleolithic and Middle Paleolithic. Hafting was a significant milestone in the history of technology. It was one of the first tools where hominins took separate elements and united them into a single tool increasing the efficiency and use of it. The development of hafting was considered a significant milestone of humans by archaeologists. It was not only a significant improvement in the technology at the time but archaeologists also believe that hafting shows the progression and development of the human mind and shows the path toward a world of complex tool making of the past. The idea of assembling two different kinds of materials into one object that improves the functioning of the tool overall shows the mental capacity of the people of that time and gives archaeologist a better understanding of the progression of human life.
Document 6: Kansyore Pottery: To understand past cultures archaeologists analyze many artifacts. Pottery proves to be of most importance to the archaeological record. Pottery is durable and even allows its broken fragments to withstand time, which would otherwise decompose other artifacts. More importantly, the style of pottery often changes through time, and shifts in shape, size, or decoration can be used to resolve the age of the artifact and/or site. Furthermore, though pottery is common, different cultures had their own distinct styles that can be used to determine its similarities or differences with one another. Therefore, even fragments of pottery can reconstruct many facets of past cultures.
Document 7: Amesbury Archer: The Amesbury Archer is an early Bronze Age man whose grave was discovered during excavations at the site of a new housing development (grid reference [ SU16324043] ) in Amesbury near Stonehenge. The grave was uncovered in May 2002, and the man is believed to date from about 2300 BC. He is nicknamed "the Archer" because of the many arrowheads that were among the artefacts buried with him. The calibrated radiocarbon dates for his grave and dating of Stonehenge suggest the sarsens and trilithons at Stonehenge may have been raised by the time he was born, although a new bluestone circle may have been raised at the same time as his birth.
Document 8: Hammer of Thor (monument): The Hammer of Thor is a 3.3 m tall, t-shaped, man-made rock formation, located along the Arnaud River in the Ungava Peninsula, Quebec, Canada. It was discovered in 1964 by an archaeologist who thought it was erected by Vikings. He named it "The Hammer of Thor", in reference to the hammer-wielding Thor of Norse culture. Today some scholars believe that it is more likely to be an artifact of Inuit culture, an inuksuk or stone landmark.
Document 9: London Hammer: The London Hammer (also known as the "London Artifact") is a name given to a hammer made of iron and wood that was found in London, Texas in 1936. Part of the hammer is embedded in a limy rock concretion, leading to it being regarded by some as an anomalous artifact, asking how an obviously man-made tool could come to be encased in a 400 million year old rock.
Document 10: Nazlet Khater: Nazlet Khater is an archeological site located in Upper Egypt. Excavations at the Nazlet Khater 2 site (Boulder Hill) yielded the remains of two human skeletons. One of the skulls was that of a male subadult. The cranium was generally modern in form, but evinced some archaic traits in the temple and mandible areas. Below the skull, the skeleton was robust but otherwise anatomically modern. Morphological analysis of the Nazlet Khater mandible indicates that the specimen was distinct from the examined Late Pleistocene and Holocene North African specimens. The Nazlet Khater 2 skeleton possesses two plesiomorphic features in its mandible, which are not found among coeval anatomically modern humans. This suggests that the specimen's ancestors may have interbred with neighboring late archaic humans. At Nazlet Khater 4 to the southeast, Upper Paleolithic axes, blades, burins, end scrapers and denticulates were also excavated. The site has been radiocarbon dated to between 30,360-35,100 years ago.The similarities between NK2 and Upper Paleolithic European samples may indicate a close relationship between this Nile Valley specimen and European Upper Paleolithic modern humans.
Document 11: Hammer (1900 automobile): The Hammer was an Australian automobile built in Mount Torrens, South Australia by bicycle mechanic Bruno Hammer.
Document 12: Art of the Upper Paleolithic: The art of the Upper Paleolithic is amongst the oldest art known (sometimes called prehistoric art). Older possible examples include the incised ochre from Blombos Cave. Upper Paleolithic art is found in Aurignacian Europe and the Levant some 40,000 years ago, and on the island of Sulawesi in Indonesia at a similar date, suggesting a much older origin perhaps in Africa. Cave art in Europe continued to the Mesolithic (at the beginnings of the Holocene) about 12,000 years ago. As this corresponds to the final phase of the last glacial period, Upper Paleolithic art is also known as "Ice Age art".
Document 13: Lithic technology: In archeology, lithic technology refers to a broad array of techniques and styles to produce usable tools from various types of stone. The earliest stone tools were recovered from modern Ethiopia and were dated to between two-million and three-million years old. The archaeological record of lithic technology is divided into three major time periods: the Paleolithic (Old Stone Age), Mesolithic (Middle Stone Age), and Neolithic (New Stone Age). Not all cultures in all parts of the world exhibit the same pattern of lithic technological development, and stone tool technology continues to be used to this day, but these three time periods represent the span of the archaeological record when lithic technology was paramount. By analysing modern stone tool usage within an ethnoarchaeological context insight into the breadth of factors influencing lithic technologies in general may be studied. See: Stone tool. For example, for the Gamo of Southern Ethiopia, political, environmental, and social factors influence the patterns of technology variation in different subgroups of the Gamo culture; through understanding the relationship between these different factors in a modern context, archaeologists can better understand the ways that these factors could have shaped the technological variation that is present in the archaeological record.
Document 14: Yarmouth Runic Stone: The Yarmouth Runic Stone, also known as the Fletcher Stone, is a slab of quartzite that first came to the attention of the public in the early 19th Century. The stone appears to have an inscription carved into it, which some investigators, notably Henry Phillips, Jr., have interpreted as Norse runes. This has led to speculation that the Yarmouth, Nova Scotia area, in Canada, was visited by Viking explorers sometime around 1000 C.E. Many other theories have been put forward, including the possibility of a hoax or the inscription being a product of natural forces. The Stone is currently on display at the Yarmouth County Museum.
Document 15: Ardjachie Stone: The Ardjachie Stone is an uncut but decorated red sandstone boulder discovered by farmers in 1960 on the Ardjachie Farm in the Tarbat peninsula of Easter Ross. It now stands outside of the museum of Tain. On it are depicted several dozen cup or ring marks probably dating to the Bronze Age. It also has an inverted-L design with a wheel image above, both of probable Pictish origin. It therefore may be considered a Class I Pictish stone.
ground_truth: An out-of-place artifact (OOPArt)