Anatomical indicators associated with fire years for redwoods in two old-growth forests at Montgomery Woods State Natural Reserve and Landels-Hill Big Creek Reserve. All samples from cross-dated lower-trunk cores. Growth proceeds from left to right. Red boxes span annual ring of fire years abbreviated in black text (85 = 1985, 99 = 1999, 08 = 2008). Black boxes in lower right corners cover 1 mm2. Red arrows indicate: A) intra-annual density fluctuation (IADF) in latewood of 1999, B) faint latewood in 1985 with subsequent missing ring for 1986, C) IADF in earlywood of 2008 for June fire, D) IADF in earlywood of 1985 for July fire with reduced growth 1986 to 1989, IADF in latewood of 1999 with subsequent smaller rings for 2000 and 2001, E) post-fire narrow ring after 2008, F) infused resin in 2008, and G) traumatic resin ducts and IADF in 2008.