Continental Drift by Opsimath

Puzzle explanation

The corrections to clue misprints spelt out “Lewis and Clark; highlight one mountain range and three rivers”. The highlighting represented the course of the 19th-century expedition by Meriwether Lewis and William Clark to explore the western part of the Louisiana Purchase: Lewis travelled down the OHIO River to meet Clark, from where they went up the MISSOURI, over the ROCKIES and down the COLUMBIA to the Pacific Ocean. The features were all shown in their approximate geographical positions, with the rivers all reading in their direction of flow. The military unit formed for the expedition was called the CORPS OF DISCOVERY, shown in the bottom row of the grid.

Clue explanations

Conventions: * = anagram, < = reversal

No Misprint Answer Explanation
Across
1 (L)ooking AEGIS AE + GIS
5 J(E)ws SIDDUR (RUDD + IS) <
9 cla(W) SCRAB S(ee) + CRAB
13 Best(I)r EXERT REX < in ET
14 In(S)ect CHIGGER EGG-RICH *
16 Sm(A)ll SOU SO + U
17 Brai(N) LOBES LO + BES(t)
18 Gree(D) PLACEMAN PLACE + MAN
19 (C)roat SLIVOWITZ (VIZ SIT LOW) *
20 he(L)p AIDE IDEA *
21 pe(A)k KIPP 2 meanings
23 A(R)ab’s QANAT QT around ANA
25 Trac(K) ROAD A in ROD
26 ric(H) IMARI (p)(r)IMARI(l)(y)
27 str(I)p UNDEIFY FUNDIE * + Y
28 (G)rowing ALPINE (E + PLAIN) *
31 W(H)ite ZORIL Z + OR + I + L
32 (L)and MOOR ROOM <
34 Conce(I)ted PSEUDO OED(i)PUS *
38 (G)lowing AGLOW AG + LOW
39 (H)ome ENCAMP (EN + P) around CAM
40 wa(T)er SODA SO + DA
41 Fo(O)d MULLET (TELL + UM) <
42 (N)ellies MOPOKES (SPOOK ME) *
43 Irvin(E)’s CORPSE COR + POSE − O
44 (M)ake DISCOVERY VERY after DISCO
Down
1 ag(O) AESC A + ESC
2 (U)FOs EXOBIOLOGY (IE around BOX) < + O’ + LOGY
3 Ave(N)s GEUM GM around EU
4 foo(T) STOCKING (GOC KNITS) *
5 Ex(A)lted SUBLIME SUB- + LIME
6 m(I)nes ICE SPAR SCRAPIE *
7 D(N)A DIPLOID (I/O + LP) < in DID
8 g(R)owing UGLI (unpl)UG LI(ght)
9 b(A)ck SECOND ENDS * around CO
10 Vau(N)ted CREW C(hurch) R(ound) E(very) W(indow)
11 (G)ive REMIT R + TIME <
12 (E)lement BENZOYL ZONE * in BY + L
15 (A)id PATHFINDER (IN FAR DEPTH) *
17 si(N)ger LIED L(ying) I(n) E(nemy) D(itch)
20 use(D) ARAMAIC (A + MARA) < + I/C
22 (T)here PREENED PREE + NED
23 (H)andle QUIDAMS QUID + A + MS
24 Yea(R)s AEONS (p)AEONS
29 b(E)ars POLAR PO + LAR
30 typ(E) ROMO PROMO − P
31 lighte(R) ZIPPO 2 meanings
33 Roll(I)ck ROMP (f)ROM P(innace)
34 (V)aulting POLE L in POE
35 (E)go SELF ELF after S
36 (R)isible JOKE JE around OK
37 (S)imple EASY (Clar)E A SY(mbol)
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